diff --git a/src/ol/renderer/canvas/canvastilelayerrenderer.js b/src/ol/renderer/canvas/canvastilelayerrenderer.js
index d445fbba87..eae181952b 100644
--- a/src/ol/renderer/canvas/canvastilelayerrenderer.js
+++ b/src/ol/renderer/canvas/canvastilelayerrenderer.js
@@ -85,15 +85,6 @@ ol.renderer.canvas.TileLayer.prototype.getImage = function() {
 };
 
 
-/**
- * @protected
- * @return {ol.layer.Tile} Tile layer.
- */
-ol.renderer.canvas.TileLayer.prototype.getTileLayer = function() {
-  return /** @type {ol.layer.Tile} */ (this.getLayer());
-};
-
-
 /**
  * @inheritDoc
  */
@@ -174,7 +165,8 @@ ol.renderer.canvas.TileLayer.prototype.renderFrame =
   var view2DState = frameState.view2DState;
   var projection = view2DState.projection;
 
-  var tileLayer = this.getTileLayer();
+  var tileLayer = this.getLayer();
+  goog.asserts.assertInstanceof(tileLayer, ol.layer.Tile);
   var tileSource = tileLayer.getTileSource();
   var tileGrid = tileSource.getTileGrid();
   if (goog.isNull(tileGrid)) {
diff --git a/src/ol/renderer/dom/domtilelayerrenderer.js b/src/ol/renderer/dom/domtilelayerrenderer.js
index 2ba7503e6c..af10ad9eba 100644
--- a/src/ol/renderer/dom/domtilelayerrenderer.js
+++ b/src/ol/renderer/dom/domtilelayerrenderer.js
@@ -65,15 +65,6 @@ ol.renderer.dom.TileLayer = function(mapRenderer, tileLayer) {
 goog.inherits(ol.renderer.dom.TileLayer, ol.renderer.dom.Layer);
 
 
-/**
- * @protected
- * @return {ol.layer.Tile} Tile layer.
- */
-ol.renderer.dom.TileLayer.prototype.getTileLayer = function() {
-  return /** @type {ol.layer.Tile} */ (this.getLayer());
-};
-
-
 /**
  * @inheritDoc
  */
@@ -91,7 +82,8 @@ ol.renderer.dom.TileLayer.prototype.renderFrame =
   var view2DState = frameState.view2DState;
   var projection = view2DState.projection;
 
-  var tileLayer = this.getTileLayer();
+  var tileLayer = this.getLayer();
+  goog.asserts.assertInstanceof(tileLayer, ol.layer.Tile);
   var tileSource = tileLayer.getTileSource();
   var tileGrid = tileSource.getTileGrid();
   if (goog.isNull(tileGrid)) {
diff --git a/src/ol/renderer/webgl/webgltilelayerrenderer.js b/src/ol/renderer/webgl/webgltilelayerrenderer.js
index 31a25952fb..7243b5d82a 100644
--- a/src/ol/renderer/webgl/webgltilelayerrenderer.js
+++ b/src/ol/renderer/webgl/webgltilelayerrenderer.js
@@ -4,6 +4,7 @@
 goog.provide('ol.renderer.webgl.TileLayer');
 
 goog.require('goog.array');
+goog.require('goog.asserts');
 goog.require('goog.object');
 goog.require('goog.vec.Mat4');
 goog.require('goog.vec.Vec4');
@@ -92,15 +93,6 @@ ol.renderer.webgl.TileLayer.prototype.disposeInternal = function() {
 };
 
 
-/**
- * @protected
- * @return {ol.layer.Tile} Tile layer.
- */
-ol.renderer.webgl.TileLayer.prototype.getTileLayer = function() {
-  return /** @type {ol.layer.Tile} */ (this.getLayer());
-};
-
-
 /**
  * @inheritDoc
  */
@@ -122,7 +114,8 @@ ol.renderer.webgl.TileLayer.prototype.renderFrame =
   var view2DState = frameState.view2DState;
   var projection = view2DState.projection;
 
-  var tileLayer = this.getTileLayer();
+  var tileLayer = this.getLayer();
+  goog.asserts.assertInstanceof(tileLayer, ol.layer.Tile);
   var tileSource = tileLayer.getTileSource();
   var tileGrid = tileSource.getTileGrid();
   if (goog.isNull(tileGrid)) {