diff --git a/arch/um/Makefile b/arch/um/Makefile
index 15ec6b86054b..b15f6048caae 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -56,6 +56,7 @@ SYS_DIR		:= $(ARCH_DIR)/include/sysdep-$(SUBARCH)
 
 CFLAGS += $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
 	$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap
+AFLAGS += $(ARCH_INCLUDE)
 
 USER_CFLAGS := $(patsubst -I%,,$(CFLAGS))
 USER_CFLAGS := $(patsubst -D__KERNEL__,,$(USER_CFLAGS)) $(ARCH_INCLUDE) \
diff --git a/arch/um/sys-i386/Makefile b/arch/um/sys-i386/Makefile
index 77c3c4d29f55..cdf6b6d4a069 100644
--- a/arch/um/sys-i386/Makefile
+++ b/arch/um/sys-i386/Makefile
@@ -22,8 +22,6 @@ STUB_CFLAGS = -Wp,-MD,$(depfile) $(call unprofile,$(USER_CFLAGS))
 # why ask why?
 $(obj)/stub_segv.o : c_flags = $(STUB_CFLAGS)
 
-$(obj)/stub.o : a_flags = $(STUB_CFLAGS)
-
 subdir- := util
 
 include arch/um/scripts/Makefile.unmap
diff --git a/arch/um/sys-x86_64/Makefile b/arch/um/sys-x86_64/Makefile
index 736d3edec581..32bb7d8219fb 100644
--- a/arch/um/sys-x86_64/Makefile
+++ b/arch/um/sys-x86_64/Makefile
@@ -33,8 +33,6 @@ STUB_CFLAGS = -Wp,-MD,$(depfile) $(call unprofile,$(USER_CFLAGS))
 # why ask why?
 $(obj)/stub_segv.o : c_flags = $(STUB_CFLAGS)
 
-$(obj)/stub.o : a_flags = $(STUB_CFLAGS)
-
 subdir- := util
 
 include arch/um/scripts/Makefile.unmap