diff --git a/Makefile b/Makefile
index 5c462d5..3ba8794 100644
--- a/Makefile
+++ b/Makefile
@@ -9,6 +9,7 @@ incremental: htmls sasss
 	cd out; unzip -n font-awesome-4.7.0.zip
 	. virtual_env/bin/activate; python -m trivial_static_image_gallery config.ini
 	-yes n | gzip -rk9q out 2>/dev/null
+	rm *.zip.gz
 
 htmls: virtual_env
 	rm -f tpl/*.html