diff --git a/demo/knockout.html b/demo/knockout.html
index 9a92c6d..8558c81 100644
--- a/demo/knockout.html
+++ b/demo/knockout.html
@@ -1,6 +1,10 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
+    <!--[if lt IE 9]>
+    <script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
+    <![endif]-->
+
     <meta charset="utf-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <meta name="viewport" content="width=device-width, initial-scale=1">
