diff --git a/src/ol/imageurlfunction.js b/src/ol/imageurlfunction.js
index 9f52622858..6ec18fbc37 100644
--- a/src/ol/imageurlfunction.js
+++ b/src/ol/imageurlfunction.js
@@ -1,7 +1,6 @@
 goog.provide('ol.ImageUrlFunction');
 goog.provide('ol.ImageUrlFunctionType');
 
-goog.require('ol.Extent');
 goog.require('ol.Size');
 
 
diff --git a/src/ol/tileurlfunction.js b/src/ol/tileurlfunction.js
index c3057b1649..c2afc86c6e 100644
--- a/src/ol/tileurlfunction.js
+++ b/src/ol/tileurlfunction.js
@@ -3,8 +3,8 @@ goog.provide('ol.TileUrlFunctionType');
 
 goog.require('goog.array');
 goog.require('goog.math');
-goog.require('ol.Extent');
 goog.require('ol.TileCoord');
+goog.require('ol.extent');
 
 
 /**
@@ -69,7 +69,7 @@ ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) {
  */
 ol.TileUrlFunction.createFromParamsFunction =
     function(baseUrl, params, paramsFunction) {
-  var tmpExtent = new ol.Extent(0, 0, 0, 0);
+  var tmpExtent = ol.extent.createEmptyExtent();
   return function(tileCoord, projection) {
     if (goog.isNull(tileCoord)) {
       return undefined;