diff --git a/extmod/modwebrepl.c b/extmod/modwebrepl.c
index b0757b288a..57792796cd 100644
--- a/extmod/modwebrepl.c
+++ b/extmod/modwebrepl.c
@@ -195,7 +195,7 @@ STATIC mp_uint_t _webrepl_read(mp_obj_t self_in, void *buf, mp_uint_t size, int
     }
 
     if (self->data_to_recv != 0) {
-        static byte filebuf[256];
+        static byte filebuf[512];
         filebuf[0] = *(byte*)buf;
         mp_uint_t buf_sz = 1;
         if (--self->data_to_recv != 0) {