diff --git a/py/builtin.c b/py/builtin.c
index 834108f1b5..b25ca42a14 100644
--- a/py/builtin.c
+++ b/py/builtin.c
@@ -154,7 +154,7 @@ MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_any_obj, mp_builtin_any);
 
 STATIC mp_obj_t mp_builtin_bin(mp_obj_t o_in) {
     mp_obj_t args[] = { MP_OBJ_NEW_QSTR(MP_QSTR__brace_open__colon__hash_b_brace_close_), o_in };
-    return mp_obj_str_format(ARRAY_SIZE(args), args);
+    return mp_obj_str_format(MP_ARRAY_SIZE(args), args);
 }
 
 MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_bin_obj, mp_builtin_bin);
diff --git a/py/builtintables.c b/py/builtintables.c
index 857a581de4..af9a9bc25e 100644
--- a/py/builtintables.c
+++ b/py/builtintables.c
@@ -150,8 +150,8 @@ const mp_obj_dict_t mp_builtin_object_dict_obj = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_builtin_object_table),
-        .alloc = ARRAY_SIZE(mp_builtin_object_table),
+        .used = MP_ARRAY_SIZE(mp_builtin_object_table),
+        .alloc = MP_ARRAY_SIZE(mp_builtin_object_table),
         .table = (mp_map_elem_t*)mp_builtin_object_table,
     },
 };
@@ -195,8 +195,8 @@ const mp_obj_dict_t mp_builtin_module_dict_obj = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_builtin_module_table),
-        .alloc = ARRAY_SIZE(mp_builtin_module_table),
+        .used = MP_ARRAY_SIZE(mp_builtin_module_table),
+        .alloc = MP_ARRAY_SIZE(mp_builtin_module_table),
         .table = (mp_map_elem_t*)mp_builtin_module_table,
     },
 };
diff --git a/py/compile.c b/py/compile.c
index 946c8924b2..b9979af148 100644
--- a/py/compile.c
+++ b/py/compile.c
@@ -111,8 +111,8 @@ STATIC const mp_map_elem_t mp_constants_table[] = {
 STATIC const mp_map_t mp_constants_map = {
     .all_keys_are_qstrs = 1,
     .table_is_fixed_array = 1,
-    .used = ARRAY_SIZE(mp_constants_table),
-    .alloc = ARRAY_SIZE(mp_constants_table),
+    .used = MP_ARRAY_SIZE(mp_constants_table),
+    .alloc = MP_ARRAY_SIZE(mp_constants_table),
     .table = (mp_map_elem_t*)mp_constants_table,
 };
 
diff --git a/py/emitinlinethumb.c b/py/emitinlinethumb.c
index 79ed1c4a02..8acee6c3ec 100644
--- a/py/emitinlinethumb.c
+++ b/py/emitinlinethumb.c
@@ -167,7 +167,7 @@ STATIC uint get_arg_reg(emit_inline_asm_t *emit, const char *op, mp_parse_node_t
     if (MP_PARSE_NODE_IS_ID(pn)) {
         qstr reg_qstr = MP_PARSE_NODE_LEAF_ARG(pn);
         const char *reg_str = qstr_str(reg_qstr);
-        for (uint i = 0; i < ARRAY_SIZE(reg_name_table); i++) {
+        for (uint i = 0; i < MP_ARRAY_SIZE(reg_name_table); i++) {
             const reg_name_t *r = &reg_name_table[i];
             if (reg_str[0] == r->name[0] && reg_str[1] == r->name[1] && reg_str[2] == r->name[2] && (reg_str[2] == '\0' || reg_str[3] == '\0')) {
                 if (r->reg > max_reg) {
@@ -286,7 +286,7 @@ STATIC void emit_inline_thumb_op(emit_inline_asm_t *emit, qstr op, int n_args, m
             asm_thumb_b_n(emit->as, label_num);
         } else if (op_str[0] == 'b' && op_len == 3) {
             uint cc = -1;
-            for (uint i = 0; i < ARRAY_SIZE(cc_name_table); i++) {
+            for (uint i = 0; i < MP_ARRAY_SIZE(cc_name_table); i++) {
                 if (op_str[1] == cc_name_table[i].name[0] && op_str[2] == cc_name_table[i].name[1]) {
                     cc = cc_name_table[i].cc;
                 }
diff --git a/py/lexer.c b/py/lexer.c
index a65df54ba6..f69c395e7e 100644
--- a/py/lexer.c
+++ b/py/lexer.c
@@ -694,10 +694,10 @@ STATIC void mp_lexer_next_token_into(mp_lexer_t *lex, mp_token_t *tok, bool firs
         // need to check for this special token in many places in the compiler.
         // TODO improve speed of these string comparisons
         //for (int i = 0; tok_kw[i] != NULL; i++) {
-        for (int i = 0; i < ARRAY_SIZE(tok_kw); i++) {
+        for (int i = 0; i < MP_ARRAY_SIZE(tok_kw); i++) {
             if (str_strn_equal(tok_kw[i], tok->str, tok->len)) {
-                if (i == ARRAY_SIZE(tok_kw) - 1) {
-                    // tok_kw[ARRAY_SIZE(tok_kw) - 1] == "__debug__"
+                if (i == MP_ARRAY_SIZE(tok_kw) - 1) {
+                    // tok_kw[MP_ARRAY_SIZE(tok_kw) - 1] == "__debug__"
                     tok->kind = (mp_optimise_value == 0 ? MP_TOKEN_KW_TRUE : MP_TOKEN_KW_FALSE);
                 } else {
                     tok->kind = MP_TOKEN_KW_FALSE + i;
diff --git a/py/misc.h b/py/misc.h
index 044fef6236..3f62e3198f 100644
--- a/py/misc.h
+++ b/py/misc.h
@@ -82,7 +82,7 @@ int m_get_peak_bytes_allocated(void);
 /** array helpers ***********************************************/
 
 // get the number of elements in a fixed-size array
-#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
+#define MP_ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
 
 /** unichar / UTF-8 *********************************************/
 
diff --git a/py/modarray.c b/py/modarray.c
index a741a0ecb4..2b9f531f96 100644
--- a/py/modarray.c
+++ b/py/modarray.c
@@ -40,8 +40,8 @@ STATIC const mp_obj_dict_t mp_module_array_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_array_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_array_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_array_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_array_globals_table),
         .table = (mp_map_elem_t*)mp_module_array_globals_table,
     },
 };
diff --git a/py/modcmath.c b/py/modcmath.c
index 3bc3055dc8..14f204b8be 100644
--- a/py/modcmath.c
+++ b/py/modcmath.c
@@ -142,8 +142,8 @@ STATIC const mp_obj_dict_t mp_module_cmath_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_cmath_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_cmath_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_cmath_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_cmath_globals_table),
         .table = (mp_map_elem_t*)mp_module_cmath_globals_table,
     },
 };
diff --git a/py/modcollections.c b/py/modcollections.c
index 9e3da7e666..2f732085ff 100644
--- a/py/modcollections.c
+++ b/py/modcollections.c
@@ -42,8 +42,8 @@ STATIC const mp_obj_dict_t mp_module_collections_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_collections_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_collections_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_collections_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_collections_globals_table),
         .table = (mp_map_elem_t*)mp_module_collections_globals_table,
     },
 };
diff --git a/py/modgc.c b/py/modgc.c
index c53eed235f..a82a7a0ebe 100644
--- a/py/modgc.c
+++ b/py/modgc.c
@@ -73,8 +73,8 @@ STATIC const mp_obj_dict_t mp_module_gc_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_gc_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_gc_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_gc_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_gc_globals_table),
         .table = (mp_map_elem_t*)mp_module_gc_globals_table,
     },
 };
diff --git a/py/modio.c b/py/modio.c
index 08c6c59dd9..e2ebc990b9 100644
--- a/py/modio.c
+++ b/py/modio.c
@@ -57,8 +57,8 @@ STATIC const mp_obj_dict_t mp_module_io_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_io_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_io_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_io_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_io_globals_table),
         .table = (mp_map_elem_t*)mp_module_io_globals_table,
     },
 };
diff --git a/py/modmath.c b/py/modmath.c
index 0fd583c2ff..ff6129c5bc 100644
--- a/py/modmath.c
+++ b/py/modmath.c
@@ -172,8 +172,8 @@ STATIC const mp_obj_dict_t mp_module_math_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_math_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_math_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_math_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_math_globals_table),
         .table = (mp_map_elem_t*)mp_module_math_globals_table,
     },
 };
diff --git a/py/modmicropython.c b/py/modmicropython.c
index 40d749da2d..c1a293a531 100644
--- a/py/modmicropython.c
+++ b/py/modmicropython.c
@@ -65,8 +65,8 @@ STATIC const mp_obj_dict_t mp_module_micropython_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_micropython_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_micropython_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_micropython_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_micropython_globals_table),
         .table = (mp_map_elem_t*)mp_module_micropython_globals_table,
     },
 };
diff --git a/py/modstruct.c b/py/modstruct.c
index a45181852c..ae6cb9eb90 100644
--- a/py/modstruct.c
+++ b/py/modstruct.c
@@ -210,8 +210,8 @@ STATIC const mp_obj_dict_t mp_module_struct_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_struct_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_struct_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_struct_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_struct_globals_table),
         .table = (mp_map_elem_t*)mp_module_struct_globals_table,
     },
 };
diff --git a/py/modsys.c b/py/modsys.c
index a99db1b7f8..519d470b0a 100644
--- a/py/modsys.c
+++ b/py/modsys.c
@@ -87,8 +87,8 @@ STATIC const mp_obj_dict_t mp_module_sys_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_sys_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_sys_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_sys_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_sys_globals_table),
         .table = (mp_map_elem_t*)mp_module_sys_globals_table,
     },
 };
diff --git a/py/objenumerate.c b/py/objenumerate.c
index 7d9ea9915a..2fdf30b23c 100644
--- a/py/objenumerate.c
+++ b/py/objenumerate.c
@@ -45,7 +45,7 @@ STATIC const mp_arg_t enumerate_make_new_args[] = {
     { MP_QSTR_iterable, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
     { MP_QSTR_start, MP_ARG_INT, {.u_int = 0} },
 };
-#define ENUMERATE_MAKE_NEW_NUM_ARGS ARRAY_SIZE(enumerate_make_new_args)
+#define ENUMERATE_MAKE_NEW_NUM_ARGS MP_ARRAY_SIZE(enumerate_make_new_args)
 
 STATIC mp_obj_t enumerate_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
 #if MICROPY_CPYTHON_COMPAT
diff --git a/stmhal/dac.c b/stmhal/dac.c
index 81ce993a8c..725e14e906 100644
--- a/stmhal/dac.c
+++ b/stmhal/dac.c
@@ -237,7 +237,7 @@ STATIC const mp_arg_t pyb_dac_write_timed_args[] = {
     { MP_QSTR_freq, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
     { MP_QSTR_mode, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = DMA_NORMAL} },
 };
-#define PYB_DAC_WRITE_TIMED_NUM_ARGS ARRAY_SIZE(pyb_dac_write_timed_args)
+#define PYB_DAC_WRITE_TIMED_NUM_ARGS MP_ARRAY_SIZE(pyb_dac_write_timed_args)
 
 mp_obj_t pyb_dac_write_timed(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     pyb_dac_obj_t *self = args[0];
diff --git a/stmhal/extint.c b/stmhal/extint.c
index 24d51ffb8d..591246cdd1 100644
--- a/stmhal/extint.c
+++ b/stmhal/extint.c
@@ -296,7 +296,7 @@ STATIC const mp_arg_t pyb_extint_make_new_args[] = {
     { MP_QSTR_pull,     MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
     { MP_QSTR_callback, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
 };
-#define PYB_EXTINT_MAKE_NEW_NUM_ARGS ARRAY_SIZE(pyb_extint_make_new_args)
+#define PYB_EXTINT_MAKE_NEW_NUM_ARGS MP_ARRAY_SIZE(pyb_extint_make_new_args)
 
 STATIC mp_obj_t extint_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
     // type_in == extint_obj_type
diff --git a/stmhal/i2c.c b/stmhal/i2c.c
index 00501a57da..b6ab531293 100644
--- a/stmhal/i2c.c
+++ b/stmhal/i2c.c
@@ -220,7 +220,7 @@ STATIC const mp_arg_t pyb_i2c_init_args[] = {
     { MP_QSTR_baudrate, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 400000} },
     { MP_QSTR_gencall,  MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
 };
-#define PYB_I2C_INIT_NUM_ARGS ARRAY_SIZE(pyb_i2c_init_args)
+#define PYB_I2C_INIT_NUM_ARGS MP_ARRAY_SIZE(pyb_i2c_init_args)
 
 STATIC mp_obj_t pyb_i2c_init_helper(const pyb_i2c_obj_t *self, uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     // parse args
@@ -271,7 +271,7 @@ STATIC mp_obj_t pyb_i2c_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const
     machine_int_t i2c_id = mp_obj_get_int(args[0]) - 1;
 
     // check i2c number
-    if (!(0 <= i2c_id && i2c_id < ARRAY_SIZE(pyb_i2c_obj) && pyb_i2c_obj[i2c_id].i2c != NULL)) {
+    if (!(0 <= i2c_id && i2c_id < MP_ARRAY_SIZE(pyb_i2c_obj) && pyb_i2c_obj[i2c_id].i2c != NULL)) {
         nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "I2C bus %d does not exist", i2c_id + 1));
     }
 
@@ -363,7 +363,7 @@ STATIC const mp_arg_t pyb_i2c_send_args[] = {
     { MP_QSTR_addr,    MP_ARG_INT, {.u_int = PYB_I2C_MASTER_ADDRESS} },
     { MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
 };
-#define PYB_I2C_SEND_NUM_ARGS ARRAY_SIZE(pyb_i2c_send_args)
+#define PYB_I2C_SEND_NUM_ARGS MP_ARRAY_SIZE(pyb_i2c_send_args)
 
 STATIC mp_obj_t pyb_i2c_send(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     pyb_i2c_obj_t *self = args[0];
@@ -414,7 +414,7 @@ STATIC const mp_arg_t pyb_i2c_recv_args[] = {
     { MP_QSTR_addr,    MP_ARG_INT, {.u_int = PYB_I2C_MASTER_ADDRESS} },
     { MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
 };
-#define PYB_I2C_RECV_NUM_ARGS ARRAY_SIZE(pyb_i2c_recv_args)
+#define PYB_I2C_RECV_NUM_ARGS MP_ARRAY_SIZE(pyb_i2c_recv_args)
 
 STATIC mp_obj_t pyb_i2c_recv(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     pyb_i2c_obj_t *self = args[0];
@@ -470,7 +470,7 @@ STATIC const mp_arg_t pyb_i2c_mem_read_args[] = {
     { MP_QSTR_memaddr, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
     { MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
 };
-#define PYB_I2C_MEM_READ_NUM_ARGS ARRAY_SIZE(pyb_i2c_mem_read_args)
+#define PYB_I2C_MEM_READ_NUM_ARGS MP_ARRAY_SIZE(pyb_i2c_mem_read_args)
 
 STATIC mp_obj_t pyb_i2c_mem_read(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     pyb_i2c_obj_t *self = args[0];
diff --git a/stmhal/led.c b/stmhal/led.c
index 8cef02425a..95b6feb280 100644
--- a/stmhal/led.c
+++ b/stmhal/led.c
@@ -61,7 +61,7 @@ STATIC const pyb_led_obj_t pyb_led_obj[] = {
 #endif
 #endif
 };
-#define NUM_LEDS ARRAY_SIZE(pyb_led_obj)
+#define NUM_LEDS MP_ARRAY_SIZE(pyb_led_obj)
 
 void led_init(void) {
     /* GPIO structure */
diff --git a/stmhal/main.c b/stmhal/main.c
index 9751dcac2e..e264fdf4b3 100644
--- a/stmhal/main.c
+++ b/stmhal/main.c
@@ -308,7 +308,7 @@ soft_reset:
             MP_OBJ_NEW_SMALL_INT(115200),
         };
         pyb_uart_global_debug = pyb_uart_type.make_new((mp_obj_t)&pyb_uart_type,
-                                                       ARRAY_SIZE(args),
+                                                       MP_ARRAY_SIZE(args),
                                                        0, args);
     }
 #else
diff --git a/stmhal/modos.c b/stmhal/modos.c
index 4a6949a844..e0df05ca6b 100644
--- a/stmhal/modos.c
+++ b/stmhal/modos.c
@@ -194,8 +194,8 @@ STATIC const mp_obj_dict_t os_module_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(os_module_globals_table),
-        .alloc = ARRAY_SIZE(os_module_globals_table),
+        .used = MP_ARRAY_SIZE(os_module_globals_table),
+        .alloc = MP_ARRAY_SIZE(os_module_globals_table),
         .table = (mp_map_elem_t*)os_module_globals_table,
     },
 };
diff --git a/stmhal/modpyb.c b/stmhal/modpyb.c
index 6879a2c1b7..9dcd0e76ca 100644
--- a/stmhal/modpyb.c
+++ b/stmhal/modpyb.c
@@ -426,8 +426,8 @@ STATIC const mp_obj_dict_t pyb_module_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(pyb_module_globals_table),
-        .alloc = ARRAY_SIZE(pyb_module_globals_table),
+        .used = MP_ARRAY_SIZE(pyb_module_globals_table),
+        .alloc = MP_ARRAY_SIZE(pyb_module_globals_table),
         .table = (mp_map_elem_t*)pyb_module_globals_table,
     },
 };
diff --git a/stmhal/modstm.c b/stmhal/modstm.c
index 520c8e51bd..1196ff82ff 100644
--- a/stmhal/modstm.c
+++ b/stmhal/modstm.c
@@ -131,8 +131,8 @@ STATIC const mp_obj_dict_t stm_module_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(stm_module_globals_table),
-        .alloc = ARRAY_SIZE(stm_module_globals_table),
+        .used = MP_ARRAY_SIZE(stm_module_globals_table),
+        .alloc = MP_ARRAY_SIZE(stm_module_globals_table),
         .table = (mp_map_elem_t*)stm_module_globals_table,
     },
 };
diff --git a/stmhal/modtime.c b/stmhal/modtime.c
index 4fbee31293..ea4e3210a6 100644
--- a/stmhal/modtime.c
+++ b/stmhal/modtime.c
@@ -122,8 +122,8 @@ STATIC const mp_obj_dict_t time_module_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(time_module_globals_table),
-        .alloc = ARRAY_SIZE(time_module_globals_table),
+        .used = MP_ARRAY_SIZE(time_module_globals_table),
+        .alloc = MP_ARRAY_SIZE(time_module_globals_table),
         .table = (mp_map_elem_t*)time_module_globals_table,
     },
 };
diff --git a/stmhal/spi.c b/stmhal/spi.c
index 10ecf7ec8e..448b8696ea 100644
--- a/stmhal/spi.c
+++ b/stmhal/spi.c
@@ -188,7 +188,7 @@ STATIC const pyb_spi_obj_t pyb_spi_obj[] = {
     {{&pyb_spi_type}, NULL},
 #endif
 };
-#define PYB_NUM_SPI ARRAY_SIZE(pyb_spi_obj)
+#define PYB_NUM_SPI MP_ARRAY_SIZE(pyb_spi_obj)
 
 STATIC void pyb_spi_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
     pyb_spi_obj_t *self = self_in;
@@ -242,7 +242,7 @@ STATIC const mp_arg_t pyb_spi_init_args[] = {
     { MP_QSTR_ti,       MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
     { MP_QSTR_crc,      MP_ARG_KW_ONLY | MP_ARG_OBJ,  {.u_obj = mp_const_none} },
 };
-#define PYB_SPI_INIT_NUM_ARGS ARRAY_SIZE(pyb_spi_init_args)
+#define PYB_SPI_INIT_NUM_ARGS MP_ARRAY_SIZE(pyb_spi_init_args)
 
 STATIC mp_obj_t pyb_spi_init_helper(const pyb_spi_obj_t *self, uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     // parse args
@@ -359,7 +359,7 @@ STATIC const mp_arg_t pyb_spi_send_args[] = {
     { MP_QSTR_send,    MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
     { MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
 };
-#define PYB_SPI_SEND_NUM_ARGS ARRAY_SIZE(pyb_spi_send_args)
+#define PYB_SPI_SEND_NUM_ARGS MP_ARRAY_SIZE(pyb_spi_send_args)
 
 STATIC mp_obj_t pyb_spi_send(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     // TODO assumes transmission size is 8-bits wide
@@ -401,7 +401,7 @@ STATIC const mp_arg_t pyb_spi_recv_args[] = {
     { MP_QSTR_recv,    MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
     { MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
 };
-#define PYB_SPI_RECV_NUM_ARGS ARRAY_SIZE(pyb_spi_recv_args)
+#define PYB_SPI_RECV_NUM_ARGS MP_ARRAY_SIZE(pyb_spi_recv_args)
 
 STATIC mp_obj_t pyb_spi_recv(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     // TODO assumes transmission size is 8-bits wide
@@ -449,7 +449,7 @@ STATIC const mp_arg_t pyb_spi_send_recv_args[] = {
     { MP_QSTR_recv,    MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
     { MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
 };
-#define PYB_SPI_SEND_RECV_NUM_ARGS ARRAY_SIZE(pyb_spi_send_recv_args)
+#define PYB_SPI_SEND_RECV_NUM_ARGS MP_ARRAY_SIZE(pyb_spi_send_recv_args)
 
 STATIC mp_obj_t pyb_spi_send_recv(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     // TODO assumes transmission size is 8-bits wide
diff --git a/stmhal/timer.c b/stmhal/timer.c
index 0ba24754b2..ec0c4dec4c 100644
--- a/stmhal/timer.c
+++ b/stmhal/timer.c
@@ -105,7 +105,7 @@ static uint32_t tim3_counter = 0;
 
 // Used to do callbacks to Python code on interrupt
 STATIC pyb_timer_obj_t *pyb_timer_obj_all[14];
-#define PYB_TIMER_OBJ_ALL_NUM ARRAY_SIZE(pyb_timer_obj_all)
+#define PYB_TIMER_OBJ_ALL_NUM MP_ARRAY_SIZE(pyb_timer_obj_all)
 
 void timer_init0(void) {
     tim3_counter = 0;
@@ -234,7 +234,7 @@ STATIC const mp_arg_t pyb_timer_init_args[] = {
     { MP_QSTR_mode,      MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = TIM_COUNTERMODE_UP} },
     { MP_QSTR_div,       MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = TIM_CLOCKDIVISION_DIV1} },
 };
-#define PYB_TIMER_INIT_NUM_ARGS ARRAY_SIZE(pyb_timer_init_args)
+#define PYB_TIMER_INIT_NUM_ARGS MP_ARRAY_SIZE(pyb_timer_init_args)
 
 STATIC mp_obj_t pyb_timer_init_helper(pyb_timer_obj_t *self, uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     // parse args
diff --git a/stmhal/uart.c b/stmhal/uart.c
index 5bbd9f299e..a85f7f9e3a 100644
--- a/stmhal/uart.c
+++ b/stmhal/uart.c
@@ -270,7 +270,7 @@ STATIC const mp_arg_t pyb_uart_init_args[] = {
     { MP_QSTR_stop,     MP_ARG_KW_ONLY | MP_ARG_INT,  {.u_int = 1} },
     { MP_QSTR_parity,   MP_ARG_KW_ONLY | MP_ARG_OBJ,  {.u_obj = mp_const_none} },
 };
-#define PYB_UART_INIT_NUM_ARGS ARRAY_SIZE(pyb_uart_init_args)
+#define PYB_UART_INIT_NUM_ARGS MP_ARRAY_SIZE(pyb_uart_init_args)
 
 STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     // parse args
@@ -396,7 +396,7 @@ STATIC const mp_arg_t pyb_uart_send_args[] = {
     { MP_QSTR_send,    MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
     { MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
 };
-#define PYB_UART_SEND_NUM_ARGS ARRAY_SIZE(pyb_uart_send_args)
+#define PYB_UART_SEND_NUM_ARGS MP_ARRAY_SIZE(pyb_uart_send_args)
 
 STATIC mp_obj_t pyb_uart_send(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     // TODO assumes transmission size is 8-bits wide
@@ -438,7 +438,7 @@ STATIC const mp_arg_t pyb_uart_recv_args[] = {
     { MP_QSTR_recv,    MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
     { MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 5000} },
 };
-#define PYB_UART_RECV_NUM_ARGS ARRAY_SIZE(pyb_uart_recv_args)
+#define PYB_UART_RECV_NUM_ARGS MP_ARRAY_SIZE(pyb_uart_recv_args)
 
 STATIC mp_obj_t pyb_uart_recv(uint n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     // TODO assumes transmission size is 8-bits wide
diff --git a/unix/modffi.c b/unix/modffi.c
index bfc840ceff..f1b219987b 100644
--- a/unix/modffi.c
+++ b/unix/modffi.c
@@ -421,8 +421,8 @@ STATIC const mp_obj_dict_t mp_module_ffi_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_ffi_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_ffi_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_ffi_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_ffi_globals_table),
         .table = (mp_map_elem_t*)mp_module_ffi_globals_table,
     },
 };
diff --git a/unix/modos.c b/unix/modos.c
index 657958d04c..2e02ef0aa7 100644
--- a/unix/modos.c
+++ b/unix/modos.c
@@ -75,8 +75,8 @@ STATIC const mp_obj_dict_t mp_module_os_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_os_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_os_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_os_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_os_globals_table),
         .table = (mp_map_elem_t*)mp_module_os_globals_table,
     },
 };
diff --git a/unix/modsocket.c b/unix/modsocket.c
index b1a34a39b8..8c5c9706c6 100644
--- a/unix/modsocket.c
+++ b/unix/modsocket.c
@@ -436,8 +436,8 @@ STATIC const mp_obj_dict_t mp_module_socket_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_socket_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_socket_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_socket_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_socket_globals_table),
         .table = (mp_map_elem_t*)mp_module_socket_globals_table,
     },
 };
diff --git a/unix/modtime.c b/unix/modtime.c
index 3cc09e3cd8..006fd0ebd7 100644
--- a/unix/modtime.c
+++ b/unix/modtime.c
@@ -113,8 +113,8 @@ STATIC const mp_obj_dict_t mp_module_time_globals = {
     .map = {
         .all_keys_are_qstrs = 1,
         .table_is_fixed_array = 1,
-        .used = ARRAY_SIZE(mp_module_time_globals_table),
-        .alloc = ARRAY_SIZE(mp_module_time_globals_table),
+        .used = MP_ARRAY_SIZE(mp_module_time_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_time_globals_table),
         .table = (mp_map_elem_t*)mp_module_time_globals_table,
     },
 };