diff --git a/static/js/PDFViewer.js b/static/js/PDFViewer.js
index 5404a423c..d128f26e8 100644
--- a/static/js/PDFViewer.js
+++ b/static/js/PDFViewer.js
@@ -59,7 +59,7 @@ Ox.PDFViewer = function(options, self) {
             .attr({
                 frameborder: 0,
                 height: self.options.height + 'px',
-                src: self.options.pdfjsURL + '?file=' + encodeURIComponent(self.options.url) + '#page=' + self.options.page,
+                src: self.options.pdfjsURL + '?' + pandora.getVersion() + '&file=' + encodeURIComponent(self.options.url) + '#page=' + self.options.page,
                 width: self.options.width + 'px'
             })
             .onMessage(function(data, event) {
diff --git a/static/js/pandora.js b/static/js/pandora.js
index 0939d1500..94c637f70 100644
--- a/static/js/pandora.js
+++ b/static/js/pandora.js
@@ -253,6 +253,7 @@ appPanel
                 });
             }
         });
+        window.pandora.getVersion = getPandoraVersion
     }
 
     function loadPandoraFiles(callback) {