diff --git a/factordiagram.html b/factordiagram.html
index 74f5b80..367c30f 100644
--- a/factordiagram.html
+++ b/factordiagram.html
@@ -3,7 +3,7 @@
 <canvas id="canvas"></canvas>
 
 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
-<script src="./underscore/underscore.js"></script>
+<script src="http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.3.3/underscore-min.js"></script>
 <script type="text/javascript">
 var canvas = $("#canvas")[0];
 var context = canvas.getContext("2d");