diff --git a/Makefile b/Makefile
index 9219d0f..70ecfb0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
 all:
-	./mkpicindex.sh > index.html
+	./mkpicindex.sh > index.html.tmp && mv index.html.tmp index.html
 clean:
-	rm -rf index.html style.css justify.js LICENSE
+	rm -rf index.html.tmp index.html style.css justify.js LICENSE