diff --git a/demo-shell-ng2/index.html b/demo-shell-ng2/index.html
index cb8e5f1fbc..32474b2d74 100644
--- a/demo-shell-ng2/index.html
+++ b/demo-shell-ng2/index.html
@@ -35,6 +35,7 @@
 
     <script src="/app/js/xml2json.js"></script>
 
+    <script src="node_modules/pdfjs-dist/web/compatibility.js"></script>
     <script src="node_modules/pdfjs-dist/build/pdf.js"></script>
     <script src="node_modules/pdfjs-dist/build/pdf.worker.js"></script>
     <script src="node_modules/pdfjs-dist/web/pdf_viewer.js"></script>