diff --git a/package/micropython/micropython.mk b/package/micropython/micropython.mk
index 7c83b18b4e..a126b3eeae 100644
--- a/package/micropython/micropython.mk
+++ b/package/micropython/micropython.mk
@@ -23,22 +23,22 @@ endif
 
 # When building from a tarball we don't have some of the dependencies that are in
 # the git repository as submodules
-MICROPYTHON_MAKE_OPTS = MICROPY_PY_BTREE=0
-MICROPYTHON_MAKE_OPTS += MICROPY_PY_USSL=0
+MICROPYTHON_MAKE_OPTS += \
+	MICROPY_PY_BTREE=0 \
+	MICROPY_PY_USSL=0 \
+	CROSS_COMPILE=$(TARGET_CROSS) \
+	CFLAGS_EXTRA=$(MICROPYTHON_CFLAGS) \
+	CWARN=
 
 define MICROPYTHON_BUILD_CMDS
 	$(MICROPYTHON_MAKE_ENV) $(MAKE) -C $(@D)/mpy-cross
 	$(MICROPYTHON_MAKE_ENV) $(MAKE) -C $(@D)/ports/unix \
-		$(MICROPYTHON_MAKE_OPTS) \
-		CROSS_COMPILE=$(TARGET_CROSS) \
-		CFLAGS_EXTRA=$(MICROPYTHON_CFLAGS)
+		$(MICROPYTHON_MAKE_OPTS)
 endef
 
 define MICROPYTHON_INSTALL_TARGET_CMDS
 	$(MICROPYTHON_MAKE_ENV) $(MAKE) -C $(@D)/ports/unix \
 		$(MICROPYTHON_MAKE_OPTS) \
-		CROSS_COMPILE=$(TARGET_CROSS) \
-		CFLAGS_EXTRA=$(MICROPYTHON_CFLAGS) \
 		DESTDIR=$(TARGET_DIR) \
 		PREFIX=/usr \
 		install