diff --git a/examples/scull/Makefile b/examples/scull/Makefile
index 089b144..12aec05 100644
--- a/examples/scull/Makefile
+++ b/examples/scull/Makefile
@@ -9,8 +9,8 @@ else
   DEBFLAGS = -O2
 endif
 
-CFLAGS += $(DEBFLAGS)
-CFLAGS += -I$(LDDINC)
+EXTRA_CFLAGS += $(DEBFLAGS)
+EXTRA_CFLAGS += -I$(LDDINC)
 
 ifneq ($(KERNELRELEASE),)
 # call from kernel build system