diff --git a/lib/codemirror.js b/lib/codemirror.js
index 0a2fbfdce8..7d73776b7f 100644
--- a/lib/codemirror.js
+++ b/lib/codemirror.js
@@ -1327,7 +1327,7 @@ window.CodeMirror = (function() {
       on(d.scroller, "dragover", drag_);
       on(d.scroller, "drop", operation(cm, onDrop));
     }
-    on(d.scroller, "paste", function(){
+    on(d.scroller, "paste", function(e){
       if (eventInWidget(d, e)) return;
       focusInput(cm); 
       fastPoll(cm);