diff --git a/lib/ace/test/mockrenderer.js b/lib/ace/test/mockrenderer.js
index 03dd9693..381a7918 100644
--- a/lib/ace/test/mockrenderer.js
+++ b/lib/ace/test/mockrenderer.js
@@ -107,8 +107,8 @@ MockRenderer.prototype.on = function() {
 MockRenderer.prototype.updateCursor = function() {
 };
 
-MockRenderer.prototype.animateScrolling = function(scrollFunc, self) {
-    scrollFunc.call(self);
+MockRenderer.prototype.animateScrolling = function(fromValue, callback) {
+    callback && callback();
 };
 
 MockRenderer.prototype.scrollToX = function(scrollTop) {};