diff --git a/doc/header.html.in b/doc/header.html.in
index 26c65b11c..9790b2d00 100644
--- a/doc/header.html.in
+++ b/doc/header.html.in
@@ -6,6 +6,7 @@
         <link rel="stylesheet" type="text/css" href="doxygen.css" title="default" media="screen,print" />
         <script type="text/javascript" src="jquery.js"></script>
         <script type="text/javascript" src="dynsections.js"></script>
+        <script type="text/javascript" src="cookie.js"></script>
         <link rel="stylesheet" type="text/css" href="search/search.css" />
         <link rel="stylesheet" type="text/css" href="searchOverrides.css" />
         <script type="text/javascript" src="search/searchdata.js"></script>