diff --git a/lib/ace/lib/event_emitter.js b/lib/ace/lib/event_emitter.js
index ef1e25a0..5818864d 100644
--- a/lib/ace/lib/event_emitter.js
+++ b/lib/ace/lib/event_emitter.js
@@ -54,7 +54,8 @@ EventEmitter._dispatchEvent = function(eventName, e) {
         return;
 
     e = e || {};
-    e.type = eventName;
+    if (!e.type)
+        e.type = eventName;
     
     if (!e.stopPropagation) {
         e.stopPropagation = function() {