diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index f52d29027d8d..7de96a6a56f9 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -31,11 +31,9 @@ cc32-as-instr = $(call try-run,\
 # arm64 one.
 # As a result we set our own flags here.
 
-# From top-level Makefile
-# NOSTDINC_FLAGS
-VDSO_CPPFLAGS := -nostdinc -isystem $(shell $(COMPATCC) -print-file-name=include)
+# KBUILD_CPPFLAGS and NOSTDINC_FLAGS from top-level Makefile
+VDSO_CPPFLAGS := -D__KERNEL__ -nostdinc -isystem $(shell $(COMPATCC) -print-file-name=include)
 VDSO_CPPFLAGS += $(LINUXINCLUDE)
-VDSO_CPPFLAGS += $(KBUILD_CPPFLAGS)
 
 # Common C and assembly flags
 # From top-level Makefile