diff --git a/src/ol/map.js b/src/ol/map.js
index 5b52b621ce..f00ecac3de 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -330,6 +330,7 @@ ol.Map = function(options) {
    * @private
    */
   this.viewportSizeMonitor_ = new goog.dom.ViewportSizeMonitor();
+  this.registerDisposable(this.viewportSizeMonitor_);
 
   goog.events.listen(this.viewportSizeMonitor_, goog.events.EventType.RESIZE,
       this.updateSize, false, this);