diff --git a/web/multi_page_viewer.js b/web/multi_page_viewer.js
index e5b97da60..856b672e1 100644
--- a/web/multi_page_viewer.js
+++ b/web/multi_page_viewer.js
@@ -515,5 +515,5 @@ window.onload = function() {
 };
 
 window.addEventListener('pdfloaded', function(evt) {
-  PDFViewer.readPDF(data);
+  PDFViewer.readPDF(evt.detail);
 }, true);