diff --git a/ports/stm32/accel.c b/ports/stm32/accel.c
index ec76727824..488391c703 100644
--- a/ports/stm32/accel.c
+++ b/ports/stm32/accel.c
@@ -70,7 +70,7 @@ STATIC void accel_start(void) {
     I2CHandle1.Init.NoStretchMode   = I2C_NOSTRETCH_DISABLE;
     I2CHandle1.Init.OwnAddress1     = PYB_I2C_MASTER_ADDRESS;
     I2CHandle1.Init.OwnAddress2     = 0xfe; // unused
-    i2c_init(&I2CHandle1);
+    pyb_i2c_init(&I2CHandle1);
 
     // turn off AVDD, wait 30ms, turn on AVDD, wait 30ms again
     mp_hal_pin_low(MICROPY_HW_MMA_AVDD_PIN); // turn off
diff --git a/ports/stm32/i2c.h b/ports/stm32/i2c.h
index 6d3ff2201f..bf43f27281 100644
--- a/ports/stm32/i2c.h
+++ b/ports/stm32/i2c.h
@@ -47,9 +47,9 @@ extern const mp_obj_type_t pyb_i2c_type;
 extern const pyb_i2c_obj_t pyb_i2c_obj[4];
 
 void i2c_init0(void);
-void i2c_init(I2C_HandleTypeDef *i2c);
-void i2c_init_freq(const pyb_i2c_obj_t *self, mp_int_t freq);
-uint32_t i2c_get_baudrate(I2C_HandleTypeDef *i2c);
+void pyb_i2c_init(I2C_HandleTypeDef *i2c);
+void pyb_i2c_init_freq(const pyb_i2c_obj_t *self, mp_int_t freq);
+uint32_t pyb_i2c_get_baudrate(I2C_HandleTypeDef *i2c);
 void i2c_ev_irq_handler(mp_uint_t i2c_id);
 void i2c_er_irq_handler(mp_uint_t i2c_id);
 
diff --git a/ports/stm32/machine_i2c.c b/ports/stm32/machine_i2c.c
index 8fc6c2a1ed..54e8425713 100644
--- a/ports/stm32/machine_i2c.c
+++ b/ports/stm32/machine_i2c.c
@@ -87,13 +87,13 @@ STATIC void machine_hard_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp
     machine_hard_i2c_obj_t *self = MP_OBJ_TO_PTR(self_in);
     mp_printf(print, "I2C(%u, freq=%u, timeout=%u)",
         self - &machine_hard_i2c_obj[0] + 1,
-        i2c_get_baudrate(self->pyb->i2c),
+        pyb_i2c_get_baudrate(self->pyb->i2c),
         *self->timeout);
 }
 
 STATIC void machine_hard_i2c_init(const machine_hard_i2c_obj_t *self, uint32_t freq, uint32_t timeout) {
     *self->timeout = timeout;
-    i2c_init_freq(self->pyb, freq);
+    pyb_i2c_init_freq(self->pyb, freq);
 }
 
 // this function is based on STM code
diff --git a/ports/stm32/pyb_i2c.c b/ports/stm32/pyb_i2c.c
index 6c135b3a5a..1b77ea0bef 100644
--- a/ports/stm32/pyb_i2c.c
+++ b/ports/stm32/pyb_i2c.c
@@ -201,7 +201,7 @@ STATIC void i2c_set_baudrate(I2C_InitTypeDef *init, uint32_t baudrate) {
                                             "Unsupported I2C baudrate: %lu", baudrate));
 }
 
-uint32_t i2c_get_baudrate(I2C_HandleTypeDef *i2c) {
+uint32_t pyb_i2c_get_baudrate(I2C_HandleTypeDef *i2c) {
     for (int i = 0; i < NUM_BAUDRATE_TIMINGS; i++) {
         if (pyb_i2c_baudrate_timing[i].timing == i2c->Init.Timing) {
             return pyb_i2c_baudrate_timing[i].baudrate;
@@ -220,7 +220,7 @@ STATIC void i2c_set_baudrate(I2C_InitTypeDef *init, uint32_t baudrate) {
     init->DutyCycle = I2C_DUTYCYCLE_16_9;
 }
 
-uint32_t i2c_get_baudrate(I2C_HandleTypeDef *i2c) {
+uint32_t pyb_i2c_get_baudrate(I2C_HandleTypeDef *i2c) {
     uint32_t pfreq = i2c->Instance->CR2 & 0x3f;
     uint32_t ccr = i2c->Instance->CCR & 0xfff;
     if (i2c->Instance->CCR & 0x8000) {
@@ -251,7 +251,7 @@ void i2c_init0(void) {
     #endif
 }
 
-void i2c_init(I2C_HandleTypeDef *i2c) {
+void pyb_i2c_init(I2C_HandleTypeDef *i2c) {
     int i2c_unit;
     const pin_obj_t *scl_pin;
     const pin_obj_t *sda_pin;
@@ -372,7 +372,7 @@ void i2c_deinit(I2C_HandleTypeDef *i2c) {
     }
 }
 
-void i2c_init_freq(const pyb_i2c_obj_t *self, mp_int_t freq) {
+void pyb_i2c_init_freq(const pyb_i2c_obj_t *self, mp_int_t freq) {
     I2C_InitTypeDef *init = &self->i2c->Init;
 
     init->AddressingMode    = I2C_ADDRESSINGMODE_7BIT;
@@ -389,7 +389,7 @@ void i2c_init_freq(const pyb_i2c_obj_t *self, mp_int_t freq) {
 
     // init the I2C bus
     i2c_deinit(self->i2c);
-    i2c_init(self->i2c);
+    pyb_i2c_init(self->i2c);
 }
 
 STATIC void i2c_reset_after_error(I2C_HandleTypeDef *i2c) {
@@ -403,7 +403,7 @@ STATIC void i2c_reset_after_error(I2C_HandleTypeDef *i2c) {
     }
     // bus was/is busy, need to reset the peripheral to get it to work again
     i2c_deinit(i2c);
-    i2c_init(i2c);
+    pyb_i2c_init(i2c);
 }
 
 void i2c_ev_irq_handler(mp_uint_t i2c_id) {
@@ -563,7 +563,7 @@ STATIC void pyb_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_ki
         mp_printf(print, "I2C(%u)", i2c_num);
     } else {
         if (in_master_mode(self)) {
-            mp_printf(print, "I2C(%u, I2C.MASTER, baudrate=%u)", i2c_num, i2c_get_baudrate(self->i2c));
+            mp_printf(print, "I2C(%u, I2C.MASTER, baudrate=%u)", i2c_num, pyb_i2c_get_baudrate(self->i2c));
         } else {
             mp_printf(print, "I2C(%u, I2C.SLAVE, addr=0x%02x)", i2c_num, (self->i2c->Instance->OAR1 >> 1) & 0x7f);
         }
@@ -612,7 +612,7 @@ STATIC mp_obj_t pyb_i2c_init_helper(const pyb_i2c_obj_t *self, size_t n_args, co
 
     // init the I2C bus
     i2c_deinit(self->i2c);
-    i2c_init(self->i2c);
+    pyb_i2c_init(self->i2c);
 
     return mp_const_none;
 }
@@ -680,10 +680,10 @@ STATIC mp_obj_t pyb_i2c_make_new(const mp_obj_type_t *type, size_t n_args, size_
     return (mp_obj_t)i2c_obj;
 }
 
-STATIC mp_obj_t pyb_i2c_init(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
+STATIC mp_obj_t pyb_i2c_init_(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
     return pyb_i2c_init_helper(args[0], n_args - 1, args + 1, kw_args);
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_i2c_init_obj, 1, pyb_i2c_init);
+STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_i2c_init_obj, 1, pyb_i2c_init_);
 
 /// \method deinit()
 /// Turn off the I2C bus.