diff --git a/drivers/simple/Makefile b/drivers/simple/Makefile
index 3b2967db57a..ff7187091c0 100644
--- a/drivers/simple/Makefile
+++ b/drivers/simple/Makefile
@@ -1,5 +1,5 @@
-EXTRA_CFLAGS +=-I$(srctree)/include/drivers
-EXTRA_CFLAGS +=-I$(srctree)/arch/$(ARCH)
-EXTRA_CFLAGS +=-I$(srctree)/arch/$(ARCH)/$(strip $(CONFIG_BSP_DIR))
+ccflags-y +=-I$(srctree)/include/drivers
+ccflags-y +=-I$(srctree)/arch/$(ARCH)
+ccflags-y +=-I$(srctree)/arch/$(ARCH)/$(strip $(CONFIG_BSP_DIR))
 
 obj-y=uart.o