diff --git a/src/ol/event/Drag.js b/src/ol/event/Drag.js
index 6b0e6a0c55..a5df4b05c4 100644
--- a/src/ol/event/Drag.js
+++ b/src/ol/event/Drag.js
@@ -2,6 +2,7 @@ goog.provide('ol.event.Drag');
 
 goog.require('ol.event.ISequence');
 goog.require('ol.event');
+goog.require('goog.object');
 goog.require('goog.fx.Dragger');
 goog.require('goog.fx.DragEvent');
 goog.require('goog.fx.Dragger.EventType');
@@ -73,6 +74,7 @@ ol.event.Drag = function(target) {
 /** @inheritDoc */
 ol.event.Drag.prototype.destroy = function() {
     this.dragger_.dispose();
+    goog.object.clear(this);
 };
 
 
diff --git a/src/ol/event/Events.js b/src/ol/event/Events.js
index aaf8a6ab05..adee15575c 100644
--- a/src/ol/event/Events.js
+++ b/src/ol/event/Events.js
@@ -1,10 +1,10 @@
 goog.provide('ol.event');
 goog.provide('ol.event.Events');
 
+goog.require('goog.object');
 goog.require('goog.events');
 goog.require('goog.events.EventType');
 goog.require('goog.events.EventTarget');
-goog.require('goog.events.Listener');
 goog.require('goog.style');
 
 /**
@@ -294,7 +294,5 @@ ol.event.Events.prototype.getPointerPosition = function(evt) {
  */
 ol.event.Events.prototype.destroy = function() {
     this.setElement(null);
-    for (var p in this) {
-        delete this[p];
-    }
+    goog.object.clear(this);
 };
\ No newline at end of file