diff --git a/ports/atmel-samd/mpconfigport.mk b/ports/atmel-samd/mpconfigport.mk
index 57f7ca339f..0d6c5a761b 100644
--- a/ports/atmel-samd/mpconfigport.mk
+++ b/ports/atmel-samd/mpconfigport.mk
@@ -57,6 +57,7 @@ CIRCUITPY_ZLIB = 0
 
 ifeq ($(INTERNAL_FLASH_FILESYSTEM),1)
 CIRCUITPY_ONEWIREIO ?= 0
+CIRCUITPY_SAFEMODE_PY ?= 0
 CIRCUITPY_USB_IDENTIFICATION ?= 0
 endif