diff --git a/demos/calendar/index.html b/demos/calendar/index.html
index 1a535b5d..bd9b4820 100644
--- a/demos/calendar/index.html
+++ b/demos/calendar/index.html
@@ -3,7 +3,7 @@
     <head>
         <title>OxJS Calendar Demo</title>
         <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
-        <script type="text/javascript" src="../../build/Ox.js"></script>
+        <script type="text/javascript" src="../../dev/Ox.js"></script>
         <script type="text/javascript" src="js/calendar.js"></script>
     </head>
     <body></body>
