diff --git a/ports/rp2/rp2_flash.c b/ports/rp2/rp2_flash.c
index cd1bc65489df..b89cb6fd8919 100644
--- a/ports/rp2/rp2_flash.c
+++ b/ports/rp2/rp2_flash.c
@@ -42,6 +42,7 @@
 #define MICROPY_HW_FLASH_STORAGE_BASE (PICO_FLASH_SIZE_BYTES - MICROPY_HW_FLASH_STORAGE_BYTES)
 #endif
 
+static_assert(MICROPY_HW_FLASH_STORAGE_BYTES <= PICO_FLASH_SIZE_BYTES, "MICROPY_HW_FLASH_STORAGE_BYTES too big");
 static_assert(MICROPY_HW_FLASH_STORAGE_BASE + MICROPY_HW_FLASH_STORAGE_BYTES <= PICO_FLASH_SIZE_BYTES, "MICROPY_HW_FLASH_STORAGE_BYTES too big");
 
 typedef struct _rp2_flash_obj_t {