diff --git a/index.js b/index.js
index 6194b4b..883daa3 100644
--- a/index.js
+++ b/index.js
@@ -92,6 +92,7 @@ Emitter.prototype.emit = function(event){
     , callbacks = this.callbacks[event];
 
   if (callbacks) {
+    callbacks = callbacks.slice(0);
     for (var i = 0, len = callbacks.length; i < len; ++i) {
       callbacks[i].apply(this, args);
     }