diff --git a/src/ol/source/stamen.js b/src/ol/source/stamen.js
index c1640f0dfc..59a1bbc319 100644
--- a/src/ol/source/stamen.js
+++ b/src/ol/source/stamen.js
@@ -6,10 +6,64 @@ goog.require('ol.source.OSM');
 goog.require('ol.source.XYZ');
 
 
+/**
+ * @classdesc
+ * Layer source for the Stamen tile server.
+ *
+ * @constructor
+ * @extends {ol.source.XYZ}
+ * @param {olx.source.StamenOptions} options Stamen options.
+ * @api stable
+ */
+ol.source.Stamen = function(options) {
+
+  var i = options.layer.indexOf('-');
+  var provider = i == -1 ? options.layer : options.layer.slice(0, i);
+  ol.DEBUG && console.assert(provider in ol.source.Stamen.ProviderConfig,
+      'known provider configured');
+  var providerConfig = ol.source.Stamen.ProviderConfig[provider];
+
+  ol.DEBUG && console.assert(options.layer in ol.source.Stamen.LayerConfig,
+      'known layer configured');
+  var layerConfig = ol.source.Stamen.LayerConfig[options.layer];
+
+  var url = options.url !== undefined ? options.url :
+      'https://stamen-tiles-{a-d}.a.ssl.fastly.net/' + options.layer +
+      '/{z}/{x}/{y}.' + layerConfig.extension;
+
+  ol.source.XYZ.call(this, {
+    attributions: ol.source.Stamen.ATTRIBUTIONS,
+    cacheSize: options.cacheSize,
+    crossOrigin: 'anonymous',
+    maxZoom: options.maxZoom != undefined ? options.maxZoom : providerConfig.maxZoom,
+    minZoom: options.minZoom != undefined ? options.minZoom : providerConfig.minZoom,
+    opaque: layerConfig.opaque,
+    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+    tileLoadFunction: options.tileLoadFunction,
+    url: url
+  });
+
+};
+ol.inherits(ol.source.Stamen, ol.source.XYZ);
+
+
+/**
+ * @const
+ * @type {Array.<ol.Attribution>}
+ */
+ol.source.Stamen.ATTRIBUTIONS = [
+  new ol.Attribution({
+    html: 'Map tiles by <a href="http://stamen.com/">Stamen Design</a>, ' +
+        'under <a href="http://creativecommons.org/licenses/by/3.0/">CC BY' +
+        ' 3.0</a>.'
+  }),
+  ol.source.OSM.ATTRIBUTION
+];
+
 /**
  * @type {Object.<string, {extension: string, opaque: boolean}>}
  */
-ol.source.StamenLayerConfig = {
+ol.source.Stamen.LayerConfig = {
   'terrain': {
     extension: 'jpg',
     opaque: true
@@ -56,11 +110,10 @@ ol.source.StamenLayerConfig = {
   }
 };
 
-
 /**
  * @type {Object.<string, {minZoom: number, maxZoom: number}>}
  */
-ol.source.StamenProviderConfig = {
+ol.source.Stamen.ProviderConfig = {
   'terrain': {
     minZoom: 4,
     maxZoom: 18
@@ -74,58 +127,3 @@ ol.source.StamenProviderConfig = {
     maxZoom: 16
   }
 };
-
-
-/**
- * @classdesc
- * Layer source for the Stamen tile server.
- *
- * @constructor
- * @extends {ol.source.XYZ}
- * @param {olx.source.StamenOptions} options Stamen options.
- * @api stable
- */
-ol.source.Stamen = function(options) {
-
-  var i = options.layer.indexOf('-');
-  var provider = i == -1 ? options.layer : options.layer.slice(0, i);
-  ol.DEBUG && console.assert(provider in ol.source.StamenProviderConfig,
-      'known provider configured');
-  var providerConfig = ol.source.StamenProviderConfig[provider];
-
-  ol.DEBUG && console.assert(options.layer in ol.source.StamenLayerConfig,
-      'known layer configured');
-  var layerConfig = ol.source.StamenLayerConfig[options.layer];
-
-  var url = options.url !== undefined ? options.url :
-      'https://stamen-tiles-{a-d}.a.ssl.fastly.net/' + options.layer +
-      '/{z}/{x}/{y}.' + layerConfig.extension;
-
-  ol.source.XYZ.call(this, {
-    attributions: ol.source.Stamen.ATTRIBUTIONS,
-    cacheSize: options.cacheSize,
-    crossOrigin: 'anonymous',
-    maxZoom: options.maxZoom != undefined ? options.maxZoom : providerConfig.maxZoom,
-    minZoom: options.minZoom != undefined ? options.minZoom : providerConfig.minZoom,
-    opaque: layerConfig.opaque,
-    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
-    tileLoadFunction: options.tileLoadFunction,
-    url: url
-  });
-
-};
-ol.inherits(ol.source.Stamen, ol.source.XYZ);
-
-
-/**
- * @const
- * @type {Array.<ol.Attribution>}
- */
-ol.source.Stamen.ATTRIBUTIONS = [
-  new ol.Attribution({
-    html: 'Map tiles by <a href="http://stamen.com/">Stamen Design</a>, ' +
-        'under <a href="http://creativecommons.org/licenses/by/3.0/">CC BY' +
-        ' 3.0</a>.'
-  }),
-  ol.source.OSM.ATTRIBUTION
-];