diff --git a/src/ol/source/bingmapssource.js b/src/ol/source/bingmapssource.js
index 268f949237..c060ee88e1 100644
--- a/src/ol/source/bingmapssource.js
+++ b/src/ol/source/bingmapssource.js
@@ -101,10 +101,11 @@ ol.source.BingMaps.prototype.handleImageryMetadataResponse =
                     /**
                      * @this {ol.source.BingMaps}
                      * @param {ol.TileCoord} tileCoord Tile coordinate.
+                     * @param {number} pixelRatio Pixel ratio.
                      * @param {ol.proj.Projection} projection Projection.
                      * @return {string|undefined} Tile URL.
                      */
-                    function(tileCoord, projection) {
+                    function(tileCoord, pixelRatio, projection) {
                       goog.asserts.assert(ol.proj.equivalent(
                           projection, this.getProjection()));
                       if (goog.isNull(tileCoord)) {
diff --git a/src/ol/source/tileimagesource.js b/src/ol/source/tileimagesource.js
index bf7d0982db..c022f117ec 100644
--- a/src/ol/source/tileimagesource.js
+++ b/src/ol/source/tileimagesource.js
@@ -126,7 +126,7 @@ ol.source.TileImage.prototype.getTile = function(z, x, y, projection) {
   } else {
     goog.asserts.assert(projection);
     var tileCoord = new ol.TileCoord(z, x, y);
-    var tileUrl = this.tileUrlFunction(tileCoord, projection);
+    var tileUrl = this.tileUrlFunction(tileCoord, 1, projection);
     var tile = new this.tileClass(
         tileCoord,
         goog.isDef(tileUrl) ? ol.TileState.IDLE : ol.TileState.EMPTY,
diff --git a/src/ol/source/tilewmssource.js b/src/ol/source/tilewmssource.js
index 027c711e3e..ba82f91753 100644
--- a/src/ol/source/tilewmssource.js
+++ b/src/ol/source/tilewmssource.js
@@ -132,11 +132,13 @@ ol.source.TileWMS.prototype.resetCoordKeyPrefix_ = function() {
 
 /**
  * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {number} pixelRatio Pixel ratio.
  * @param {ol.proj.Projection} projection Projection.
  * @private
  * @return {string|undefined} Tile URL.
  */
-ol.source.TileWMS.prototype.tileUrlFunction_ = function(tileCoord, projection) {
+ol.source.TileWMS.prototype.tileUrlFunction_ =
+    function(tileCoord, pixelRatio, projection) {
 
   var urls = this.urls_;
   if (!goog.isDef(urls) || goog.array.isEmpty(urls)) {
diff --git a/src/ol/source/wmtssource.js b/src/ol/source/wmtssource.js
index 15e2aae7bb..bd0d7c514b 100644
--- a/src/ol/source/wmtssource.js
+++ b/src/ol/source/wmtssource.js
@@ -96,10 +96,11 @@ ol.source.WMTS = function(options) {
         /**
          * @this {ol.source.WMTS}
          * @param {ol.TileCoord} tileCoord Tile coordinate.
+         * @param {number} pixelRatio Pixel ratio.
          * @param {ol.proj.Projection} projection Projection.
          * @return {string|undefined} Tile URL.
          */
-        function(tileCoord, projection) {
+        function(tileCoord, pixelRatio, projection) {
           if (goog.isNull(tileCoord)) {
             return undefined;
           } else {
diff --git a/src/ol/source/zoomifysource.js b/src/ol/source/zoomifysource.js
index 7e1a372d47..011b8056ca 100644
--- a/src/ol/source/zoomifysource.js
+++ b/src/ol/source/zoomifysource.js
@@ -61,10 +61,11 @@ ol.source.Zoomify = function(opt_options) {
       /**
        * @this {ol.source.TileImage}
        * @param {ol.TileCoord} tileCoord Tile Coordinate.
+       * @param {number} pixelRatio Pixel ratio.
        * @param {ol.proj.Projection} projection Projection.
        * @return {string|undefined} Tile URL.
        */
-      function(tileCoord, projection) {
+      function(tileCoord, pixelRatio, projection) {
         if (goog.isNull(tileCoord)) {
           return undefined;
         } else {
diff --git a/src/ol/tileurlfunction.js b/src/ol/tileurlfunction.js
index 8b8e17620b..ed7a17d9c3 100644
--- a/src/ol/tileurlfunction.js
+++ b/src/ol/tileurlfunction.js
@@ -8,7 +8,7 @@ goog.require('ol.TileCoord');
 
 /**
  * @typedef {function(this: ol.source.TileImage, ol.TileCoord,
- *     ol.proj.Projection): (string|undefined)}
+ *     number, ol.proj.Projection): (string|undefined)}
  */
 ol.TileUrlFunctionType;
 
@@ -29,10 +29,11 @@ ol.TileUrlFunction.createFromTemplate = function(template) {
       /**
        * @this {ol.source.TileImage}
        * @param {ol.TileCoord} tileCoord Tile Coordinate.
+       * @param {number} pixelRatio Pixel ratio.
        * @param {ol.proj.Projection} projection Projection.
        * @return {string|undefined} Tile URL.
        */
-      function(tileCoord, projection) {
+      function(tileCoord, pixelRatio, projection) {
         if (goog.isNull(tileCoord)) {
           return undefined;
         } else {
@@ -66,16 +67,18 @@ ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) {
       /**
        * @this {ol.source.TileImage}
        * @param {ol.TileCoord} tileCoord Tile Coordinate.
+       * @param {number} pixelRatio Pixel ratio.
        * @param {ol.proj.Projection} projection Projection.
        * @return {string|undefined} Tile URL.
        */
-      function(tileCoord, projection) {
+      function(tileCoord, pixelRatio, projection) {
         if (goog.isNull(tileCoord)) {
           return undefined;
         } else {
           var index =
               goog.math.modulo(tileCoord.hash(), tileUrlFunctions.length);
-          return tileUrlFunctions[index].call(this, tileCoord, projection);
+          return tileUrlFunctions[index].call(
+              this, tileCoord, pixelRatio, projection);
         }
       });
 };
@@ -84,10 +87,12 @@ ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) {
 /**
  * @this {ol.source.TileImage}
  * @param {ol.TileCoord} tileCoord Tile coordinate.
+ * @param {number} pixelRatio Pixel ratio.
  * @param {ol.proj.Projection} projection Projection.
  * @return {string|undefined} Tile URL.
  */
-ol.TileUrlFunction.nullTileUrlFunction = function(tileCoord, projection) {
+ol.TileUrlFunction.nullTileUrlFunction =
+    function(tileCoord, pixelRatio, projection) {
   return undefined;
 };
 
@@ -104,16 +109,18 @@ ol.TileUrlFunction.withTileCoordTransform =
       /**
        * @this {ol.source.TileImage}
        * @param {ol.TileCoord} tileCoord Tile Coordinate.
+       * @param {number} pixelRatio Pixel ratio.
        * @param {ol.proj.Projection} projection Projection.
        * @return {string|undefined} Tile URL.
        */
-      function(tileCoord, projection) {
+      function(tileCoord, pixelRatio, projection) {
         if (goog.isNull(tileCoord)) {
           return undefined;
         } else {
           return tileUrlFunction.call(
               this,
               transformFn.call(this, tileCoord, projection, tmpTileCoord),
+              pixelRatio,
               projection);
         }
       });