diff --git a/lms/templates/static_pdfbook.html b/lms/templates/static_pdfbook.html
index 4e9f604a0c2d..d1ec14c1a67c 100644
--- a/lms/templates/static_pdfbook.html
+++ b/lms/templates/static_pdfbook.html
@@ -13,6 +13,7 @@
 <%static:js group='courseware'/>
 <link rel="stylesheet" href="/static/css/pdfviewer.css"/>
 <script type="text/javascript" src="/static/js/vendor/pdfjs/pdf.js"></script>
+<script type="text/javascript" src="/static/js/vendor/pdfjs/compatibility.js"></script>
 <script type="text/javascript" src="/static/js/pdfviewer.js"></script>
 </%block>