diff --git a/tests/frontend/index.html b/tests/frontend/index.html
index 70158052..f89f419e 100644
--- a/tests/frontend/index.html
+++ b/tests/frontend/index.html
@@ -10,7 +10,7 @@
     <div id="iframe-container"></div>
 
     <script src="/static/js/jquery.js"></script>
-    <script src="http://underscorejs.org/underscore.js"></script>
+    <script src="lib/underscore.js"></script>
 
     <script src="lib/mocha.js"></script>
     <script> mocha.setup('bdd') </script>