diff --git a/arch/um/Makefile b/arch/um/Makefile
index f1d4d67157be..3dbd0e3b660e 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -148,7 +148,7 @@ export LDFLAGS_vmlinux := $(LDFLAGS_EXECSTACK)
 # When cleaning we don't include .config, so we don't include
 # TT or skas makefiles and don't clean skas_ptregs.h.
 CLEAN_FILES += linux x.i gmon.out
-MRPROPER_FILES += arch/$(SUBARCH)/include/generated
+MRPROPER_FILES += $(HOST_DIR)/include/generated
 
 archclean:
 	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \