diff --git a/src/ol/renderer/webgl/webglmaprenderer.js b/src/ol/renderer/webgl/webglmaprenderer.js
index fa84cac5b8..12d5982bee 100644
--- a/src/ol/renderer/webgl/webglmaprenderer.js
+++ b/src/ol/renderer/webgl/webglmaprenderer.js
@@ -107,7 +107,7 @@ ol.renderer.webgl.Map = function(container, map) {
 
   /**
    * @private
-   * @type {ol.structs.LRUCache}
+   * @type {ol.structs.LRUCache.<ol.renderer.webgl.TextureCacheEntry|null>}
    */
   this.textureCache_ = new ol.structs.LRUCache();
 
@@ -141,7 +141,7 @@ ol.renderer.webgl.Map = function(container, map) {
                 Math.sqrt(deltaX * deltaX + deltaY * deltaY) / tileResolution;
           }, this),
       /**
-       * @param {Array} element Element.
+       * @param {Array.<*>} element Element.
        * @return {string} Key.
        */
       function(element) {
@@ -189,8 +189,8 @@ ol.renderer.webgl.Map.prototype.bindTileTexture =
   var gl = this.getGL();
   var tileKey = tile.getKey();
   if (this.textureCache_.containsKey(tileKey)) {
-    var textureCacheEntry = /** @type {ol.renderer.webgl.TextureCacheEntry} */
-        (this.textureCache_.get(tileKey));
+    var textureCacheEntry = this.textureCache_.get(tileKey);
+    goog.asserts.assert(!goog.isNull(textureCacheEntry));
     gl.bindTexture(goog.webgl.TEXTURE_2D, textureCacheEntry.texture);
     if (textureCacheEntry.magFilter != magFilter) {
       gl.texParameteri(
@@ -283,7 +283,7 @@ ol.renderer.webgl.Map.prototype.disposeInternal = function() {
   if (!gl.isContextLost()) {
     this.textureCache_.forEach(
         /**
-         * @param {ol.renderer.webgl.TextureCacheEntry} textureCacheEntry
+         * @param {?ol.renderer.webgl.TextureCacheEntry} textureCacheEntry
          *     Texture cache entry.
          */
         function(textureCacheEntry) {
@@ -307,8 +307,7 @@ ol.renderer.webgl.Map.prototype.expireCache_ = function(map, frameState) {
   var textureCacheEntry;
   while (this.textureCache_.getCount() - this.textureCacheFrameMarkerCount_ >
       ol.WEBGL_TEXTURE_CACHE_HIGH_WATER_MARK) {
-    textureCacheEntry = /** @type {?ol.renderer.webgl.TextureCacheEntry} */
-        (this.textureCache_.peekLast());
+    textureCacheEntry = this.textureCache_.peekLast();
     if (goog.isNull(textureCacheEntry)) {
       if (+this.textureCache_.peekLastKey() == frameState.index) {
         break;
diff --git a/src/ol/structs/lrucache.js b/src/ol/structs/lrucache.js
index e5fecc8d2e..d1b1f3a6c5 100644
--- a/src/ol/structs/lrucache.js
+++ b/src/ol/structs/lrucache.js
@@ -162,7 +162,7 @@ ol.structs.LRUCache.prototype.getKeys = function() {
 
 
 /**
- * @return {Array} Values.
+ * @return {Array.<T>} Values.
  */
 ol.structs.LRUCache.prototype.getValues = function() {
   var values = new Array(this.count_);