diff --git a/drivers/ieee802154/Makefile b/drivers/ieee802154/Makefile
index e0e8e1a184ffa3ff7c7c02682d6fb9eb8c982330..68999137dedfe24cb7044d6de38b6e4f6f8193c5 100644
--- a/drivers/ieee802154/Makefile
+++ b/drivers/ieee802154/Makefile
@@ -1,3 +1,3 @@
 obj-$(CONFIG_IEEE802154_FAKEHARD) += fakehard.o
 
-EXTRA_CFLAGS += -DDEBUG -DCONFIG_FFD
+ccflags-y := -DDEBUG -DCONFIG_FFD