diff --git a/package/micropython/micropython.mk b/package/micropython/micropython.mk
index 32b361db16..e1e1f88d51 100644
--- a/package/micropython/micropython.mk
+++ b/package/micropython/micropython.mk
@@ -42,7 +42,7 @@ MICROPYTHON_MAKE_OPTS += \
 	MICROPY_PY_BTREE=0 \
 	MICROPY_PY_USSL=0 \
 	CROSS_COMPILE=$(TARGET_CROSS) \
-	CFLAGS_EXTRA=$(MICROPYTHON_CFLAGS) \
+	CFLAGS_EXTRA="$(MICROPYTHON_CFLAGS)" \
 	LDFLAGS_EXTRA="$(TARGET_LDFLAGS)" \
 	CWARN=