diff --git a/Makefile b/Makefile
index ecf84b7..7c57d5e 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ github-markdown.min.css:
 
 .PHONY: clean
 clean:
-	rm -f $(html_files) render_md nightly_link
+	rm -f $(html_files) $(vendored_files) render_md nightly_link
 
 .PHONY: run
 run: nightly_link