diff --git a/runtime/doc/Makefile b/runtime/doc/Makefile
index 785128e..707b24b 100644
--- a/runtime/doc/Makefile
+++ b/runtime/doc/Makefile
@@ -93,7 +93,7 @@
 	$(VIMPROG) --clean -S test_urls.vim
 
 clean:
-	-rm -f doctags *.html tags.ref
+	-rm -f doctags *.html tags.ref tags-* vim-stylesheet.css
 
 # These files are in the extra archive, skip if not present