diff --git a/src/reader_assets/js/pdfviewer-main.js b/src/reader_assets/js/pdfviewer-main.js
index 6b7a051..2f4347a 100644
--- a/src/reader_assets/js/pdfviewer-main.js
+++ b/src/reader_assets/js/pdfviewer-main.js
@@ -13,6 +13,7 @@ $(function(){
   var pdf_viewer = $('.pdfviewer');
   if(pdf_url)
   {
+    PDFJS.disableRange = false;
     PDFJS.getDocument(pdf_url, null, null, downloadProgressHandler)
       .then(function(pdf)
       {