diff --git a/lib/ace/lib/event_emitter.js b/lib/ace/lib/event_emitter.js
index 9bd0b975..39d76f9a 100644
--- a/lib/ace/lib/event_emitter.js
+++ b/lib/ace/lib/event_emitter.js
@@ -106,6 +106,7 @@ EventEmitter.addEventListener = function(eventName, callback, capturing) {
     return callback;
 };
 
+EventEmitter.off =
 EventEmitter.removeListener =
 EventEmitter.removeEventListener = function(eventName, callback) {
     this._eventRegistry = this._eventRegistry || {};