diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index 805591766e..aa6caae098 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -34,6 +34,7 @@ clean:
 	rm -f *.o *.s *~ core boot/*.o boot/*~ boot/core boot/mkelf32
 	rm -f x86_32/*.o x86_32/*~ x86_32/core
 	rm -f x86_64/*.o x86_64/*~ x86_64/core
+	rm -f mtrr/*.o mtrr/*~ mtrr/core
 
 # setup.o contains bits of compile.h so it must be blown away
 delete-unfresh-files: