diff --git a/src/ol/renderer/maprenderer.js b/src/ol/renderer/maprenderer.js
index <HASH>..<HASH> 100644
--- a/src/ol/renderer/maprenderer.js
+++ b/src/ol/renderer/maprenderer.js
@@ -92,9 +92,7 @@ ol.renderer.Map.prototype.createLayerRenderer = function(layer) {
  * @inheritDoc
  */
 ol.renderer.Map.prototype.disposeInternal = function() {
-  goog.object.forEach(this.layerRenderers_, function(layerRenderer) {
-    goog.dispose(layerRenderer);
-  });
+  goog.object.forEach(this.layerRenderers_, goog.dispose);
   goog.base(this, 'disposeInternal');
 };
Simplify goog.object.forEach call