diff --git a/common/static/js/pdfviewer.js b/common/static/js/pdfviewer.js
index 3424a09892..a76e2f397c 100755
--- a/common/static/js/pdfviewer.js
+++ b/common/static/js/pdfviewer.js
@@ -327,11 +327,11 @@ PDFJS.disableWorker = true;
             loadUrl(chapterUrl, pageVal);
         }
 
-        $(".last").on('click','#previous',function(){
+        $("#previous").click(function(event) {
             prevPage();
         });
 
-        $(".next").on('click','#next',function(){
+        $("#next").click(function(event) {
             nextPage();
         });