diff --git a/supervisor/stub/internal_flash.c b/supervisor/stub/internal_flash.c
index 3a4ba935de..23e843c923 100644
--- a/supervisor/stub/internal_flash.c
+++ b/supervisor/stub/internal_flash.c
@@ -46,7 +46,8 @@ uint32_t supervisor_flash_get_block_count(void) {
     return 0;
 }
 
-void supervisor_flash_flush(void) {
+void port_internal_flash_flush(void) {
+    return;
 }
 
 mp_uint_t supervisor_flash_read_blocks(uint8_t *dest, uint32_t block, uint32_t num_blocks) {