diff --git a/kallithea/public/js/base.js b/kallithea/public/js/base.js
--- a/kallithea/public/js/base.js
+++ b/kallithea/public/js/base.js
@@ -1886,7 +1886,7 @@ var branchSort = function(results, conta
 $(document).ready(function(){
     $('.diff-collapse-button').click(function(e) {
         var $button = $(e.currentTarget);
-        var $target = $('#' + $button.prop('target'));
+        var $target = $('#' + $button.attr('target'));
         if($target.hasClass('hidden')){
             $target.removeClass('hidden');
             $button.html("↑ {0} ↑".format(_TM['Collapse Diff']));