diff --git a/src/ol/webgl/tilelayerrenderer.js b/src/ol/webgl/tilelayerrenderer.js
index 5e1f136d5f..04fb35aaed 100644
--- a/src/ol/webgl/tilelayerrenderer.js
+++ b/src/ol/webgl/tilelayerrenderer.js
@@ -114,6 +114,15 @@ ol.webgl.TileLayerRenderer = function(map, tileLayer) {
 goog.inherits(ol.webgl.TileLayerRenderer, ol.webgl.LayerRenderer);
 
 
+/**
+ * @return {ol.TileLayer} Layer.
+ * @override
+ */
+ol.webgl.TileLayerRenderer.prototype.getLayer = function() {
+  return /** @type {ol.TileLayer} */ goog.base(this, 'getLayer');
+};
+
+
 /**
  * @inheritDoc
  */
@@ -176,7 +185,7 @@ ol.webgl.TileLayerRenderer.prototype.redraw = function() {
     return;
   }
 
-  var tileLayer = /** @type {ol.TileLayer} */ (this.getLayer());
+  var tileLayer = this.getLayer();
   var tileStore = tileLayer.getStore();
   var tileGrid = tileStore.getTileGrid();
   var z = tileGrid.getZForResolution(resolution);