diff --git a/scripts/Makefile.clang b/scripts/Makefile.clang
index 9076cc939e87..058a4c0f864e 100644
--- a/scripts/Makefile.clang
+++ b/scripts/Makefile.clang
@@ -34,6 +34,5 @@ CLANG_FLAGS	+= -Werror=unknown-warning-option
 CLANG_FLAGS	+= -Werror=ignored-optimization-argument
 CLANG_FLAGS	+= -Werror=option-ignored
 CLANG_FLAGS	+= -Werror=unused-command-line-argument
-KBUILD_CFLAGS	+= $(CLANG_FLAGS)
-KBUILD_AFLAGS	+= $(CLANG_FLAGS)
+KBUILD_CPPFLAGS	+= $(CLANG_FLAGS)
 export CLANG_FLAGS