diff --git a/arch/um/Makefile b/arch/um/Makefile
index 48d92bb..5ab2b17 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -36,8 +36,7 @@ HEADER_ARCH 	:= $(SUBARCH)
 # Additional ARCH settings for x86
 ifeq ($(SUBARCH),i386)
         HEADER_ARCH := x86
-endif
-ifeq ($(SUBARCH),x86_64)
+else
         HEADER_ARCH := x86
 	KBUILD_CFLAGS += -mcmodel=large
 endif