diff --git a/packages/minifiers/urlrewriting-tests.js b/packages/minifiers/urlrewriting-tests.js
index 6314f619c7..4c65f4833d 100644
--- a/packages/minifiers/urlrewriting-tests.js
+++ b/packages/minifiers/urlrewriting-tests.js
@@ -29,4 +29,5 @@ Tinytest.add("minifiers - url rewriting when merging", function (test) {
   t('http://i.imgur.com/fBcdJIh.gif', 'http://i.imgur.com/fBcdJIh.gif', 'complete URL');
   t('"http://i.imgur.com/fBcdJIh.gif"', '"http://i.imgur.com/fBcdJIh.gif"', 'complete quoted URL');
   t('data:image/png;base64,iVBORw0K=', 'data:image/png;base64,iVBORw0K=', 'data URI');
+  t('http://', '', 'manformed URL');
 });