diff --git a/Makefile b/Makefile
index 750f8a84b1f..c10bf71b9ac 100644
--- a/Makefile
+++ b/Makefile
@@ -608,6 +608,7 @@ CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
 endif
 CLANG_FLAGS	+= -no-integrated-as
 KBUILD_CFLAGS	+= $(CLANG_FLAGS)
+KBUILD_CPPFLAGS	+= $(CLANG_FLAGS)
 KBUILD_AFLAGS	+= $(CLANG_FLAGS)
 export CLANG_FLAGS
 endif