diff --git a/src/ol/source/Image.js b/src/ol/source/Image.js
index 7a2e76f934..c34d4bf925 100644
--- a/src/ol/source/Image.js
+++ b/src/ol/source/Image.js
@@ -9,7 +9,7 @@ import Event from '../events/Event.js';
 import {equals} from '../extent.js';
 import {equivalent} from '../proj.js';
 import _ol_reproj_Image_ from '../reproj/Image.js';
-import _ol_source_Source_ from '../source/Source.js';
+import Source from '../source/Source.js';
 
 /**
  * @classdesc
@@ -24,7 +24,7 @@ import _ol_source_Source_ from '../source/Source.js';
  * @api
  */
 var _ol_source_Image_ = function(options) {
-  _ol_source_Source_.call(this, {
+  Source.call(this, {
     attributions: options.attributions,
     extent: options.extent,
     projection: options.projection,
@@ -53,7 +53,7 @@ var _ol_source_Image_ = function(options) {
   this.reprojectedRevision_ = 0;
 };
 
-inherits(_ol_source_Image_, _ol_source_Source_);
+inherits(_ol_source_Image_, Source);
 
 
 /**
diff --git a/src/ol/source/Source.js b/src/ol/source/Source.js
index 70cbbebcf3..58c30401dc 100644
--- a/src/ol/source/Source.js
+++ b/src/ol/source/Source.js
@@ -21,7 +21,7 @@ import SourceState from '../source/State.js';
  * @param {ol.SourceSourceOptions} options Source options.
  * @api
  */
-var _ol_source_Source_ = function(options) {
+var Source = function(options) {
 
   _ol_Object_.call(this);
 
@@ -52,14 +52,14 @@ var _ol_source_Source_ = function(options) {
 
 };
 
-inherits(_ol_source_Source_, _ol_Object_);
+inherits(Source, _ol_Object_);
 
 /**
  * Turns the attributions option into an attributions function.
  * @param {ol.AttributionLike|undefined} attributionLike The attribution option.
  * @return {?ol.Attribution} An attribution function (or null).
  */
-_ol_source_Source_.prototype.adaptAttributions_ = function(attributionLike) {
+Source.prototype.adaptAttributions_ = function(attributionLike) {
   if (!attributionLike) {
     return null;
   }
@@ -89,14 +89,14 @@ _ol_source_Source_.prototype.adaptAttributions_ = function(attributionLike) {
  * @return {T|undefined} Callback result.
  * @template T
  */
-_ol_source_Source_.prototype.forEachFeatureAtCoordinate = nullFunction;
+Source.prototype.forEachFeatureAtCoordinate = nullFunction;
 
 
 /**
  * Get the attribution function for the source.
  * @return {?ol.Attribution} Attribution function.
  */
-_ol_source_Source_.prototype.getAttributions = function() {
+Source.prototype.getAttributions = function() {
   return this.attributions_;
 };
 
@@ -106,7 +106,7 @@ _ol_source_Source_.prototype.getAttributions = function() {
  * @return {ol.proj.Projection} Projection.
  * @api
  */
-_ol_source_Source_.prototype.getProjection = function() {
+Source.prototype.getProjection = function() {
   return this.projection_;
 };
 
@@ -115,7 +115,7 @@ _ol_source_Source_.prototype.getProjection = function() {
  * @abstract
  * @return {Array.<number>|undefined} Resolutions.
  */
-_ol_source_Source_.prototype.getResolutions = function() {};
+Source.prototype.getResolutions = function() {};
 
 
 /**
@@ -123,7 +123,7 @@ _ol_source_Source_.prototype.getResolutions = function() {};
  * @return {ol.source.State} State.
  * @api
  */
-_ol_source_Source_.prototype.getState = function() {
+Source.prototype.getState = function() {
   return this.state_;
 };
 
@@ -131,7 +131,7 @@ _ol_source_Source_.prototype.getState = function() {
 /**
  * @return {boolean|undefined} Wrap X.
  */
-_ol_source_Source_.prototype.getWrapX = function() {
+Source.prototype.getWrapX = function() {
   return this.wrapX_;
 };
 
@@ -140,7 +140,7 @@ _ol_source_Source_.prototype.getWrapX = function() {
  * Refreshes the source and finally dispatches a 'change' event.
  * @api
  */
-_ol_source_Source_.prototype.refresh = function() {
+Source.prototype.refresh = function() {
   this.changed();
 };
 
@@ -152,7 +152,7 @@ _ol_source_Source_.prototype.refresh = function() {
  *     or `undefined`.
  * @api
  */
-_ol_source_Source_.prototype.setAttributions = function(attributions) {
+Source.prototype.setAttributions = function(attributions) {
   this.attributions_ = this.adaptAttributions_(attributions);
   this.changed();
 };
@@ -163,8 +163,8 @@ _ol_source_Source_.prototype.setAttributions = function(attributions) {
  * @param {ol.source.State} state State.
  * @protected
  */
-_ol_source_Source_.prototype.setState = function(state) {
+Source.prototype.setState = function(state) {
   this.state_ = state;
   this.changed();
 };
-export default _ol_source_Source_;
+export default Source;
diff --git a/src/ol/source/Tile.js b/src/ol/source/Tile.js
index b5a9138fb9..afc44f8674 100644
--- a/src/ol/source/Tile.js
+++ b/src/ol/source/Tile.js
@@ -7,7 +7,7 @@ import _ol_TileState_ from '../TileState.js';
 import Event from '../events/Event.js';
 import {equivalent} from '../proj.js';
 import _ol_size_ from '../size.js';
-import _ol_source_Source_ from '../source/Source.js';
+import Source from '../source/Source.js';
 import _ol_tilecoord_ from '../tilecoord.js';
 import _ol_tilegrid_ from '../tilegrid.js';
 
@@ -25,7 +25,7 @@ import _ol_tilegrid_ from '../tilegrid.js';
  */
 var _ol_source_Tile_ = function(options) {
 
-  _ol_source_Source_.call(this, {
+  Source.call(this, {
     attributions: options.attributions,
     extent: options.extent,
     projection: options.projection,
@@ -78,7 +78,7 @@ var _ol_source_Tile_ = function(options) {
 
 };
 
-inherits(_ol_source_Tile_, _ol_source_Source_);
+inherits(_ol_source_Tile_, Source);
 
 
 /**
diff --git a/src/ol/source/Vector.js b/src/ol/source/Vector.js
index 306416d4f0..11eb1bddb9 100644
--- a/src/ol/source/Vector.js
+++ b/src/ol/source/Vector.js
@@ -16,7 +16,7 @@ import {xhr} from '../featureloader.js';
 import {TRUE} from '../functions.js';
 import _ol_loadingstrategy_ from '../loadingstrategy.js';
 import _ol_obj_ from '../obj.js';
-import _ol_source_Source_ from '../source/Source.js';
+import Source from '../source/Source.js';
 import SourceState from '../source/State.js';
 import VectorEventType from '../source/VectorEventType.js';
 import RBush from '../structs/RBush.js';
@@ -37,7 +37,7 @@ var _ol_source_Vector_ = function(opt_options) {
 
   var options = opt_options || {};
 
-  _ol_source_Source_.call(this, {
+  Source.call(this, {
     attributions: options.attributions,
     projection: undefined,
     state: SourceState.READY,
@@ -149,7 +149,7 @@ var _ol_source_Vector_ = function(opt_options) {
 
 };
 
-inherits(_ol_source_Vector_, _ol_source_Source_);
+inherits(_ol_source_Vector_, Source);
 
 
 /**
diff --git a/test/spec/ol/layer/group.test.js b/test/spec/ol/layer/group.test.js
index d759e11ec7..266827b055 100644
--- a/test/spec/ol/layer/group.test.js
+++ b/test/spec/ol/layer/group.test.js
@@ -6,7 +6,7 @@ import _ol_layer_Group_ from '../../../../src/ol/layer/Group.js';
 import _ol_layer_Layer_ from '../../../../src/ol/layer/Layer.js';
 import _ol_obj_ from '../../../../src/ol/obj.js';
 import _ol_renderer_Map_ from '../../../../src/ol/renderer/Map.js';
-import _ol_source_Source_ from '../../../../src/ol/source/Source.js';
+import Source from '../../../../src/ol/source/Source.js';
 
 
 describe('ol.layer.Group', function() {
@@ -61,7 +61,7 @@ describe('ol.layer.Group', function() {
     var layer, group, listener;
     beforeEach(function() {
       layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: 'EPSG:4326'
         })
       });
@@ -100,7 +100,7 @@ describe('ol.layer.Group', function() {
     var layer, group, listener;
     beforeEach(function() {
       layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: 'EPSG:4326'
         })
       });
@@ -138,7 +138,7 @@ describe('ol.layer.Group', function() {
 
     it('accepts options', function() {
       var layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: 'EPSG:4326'
         })
       });
@@ -176,7 +176,7 @@ describe('ol.layer.Group', function() {
 
     it('accepts an extent option', function() {
       var layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: 'EPSG:4326'
         })
       });
@@ -311,7 +311,7 @@ describe('ol.layer.Group', function() {
 
     it('sets layers property', function() {
       var layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: 'EPSG:4326'
         })
       });
@@ -342,12 +342,12 @@ describe('ol.layer.Group', function() {
     });
 
     var layer1 = new _ol_layer_Layer_({
-      source: new _ol_source_Source_({
+      source: new Source({
         projection: 'EPSG:4326'
       })
     });
     var layer2 = new _ol_layer_Layer_({
-      source: new _ol_source_Source_({
+      source: new Source({
         projection: 'EPSG:4326'
       }),
       opacity: 0.5,
@@ -356,7 +356,7 @@ describe('ol.layer.Group', function() {
       minResolution: 0.25
     });
     var layer3 = new _ol_layer_Layer_({
-      source: new _ol_source_Source_({
+      source: new Source({
         projection: 'EPSG:4326'
       }),
       extent: [-5, -2, 5, 2]
@@ -461,14 +461,14 @@ describe('ol.layer.Group', function() {
 
     it('orders layer with higher Z-index on top', function() {
       var layer10 = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: 'EPSG:4326'
         })
       });
       layer10.setZIndex(10);
 
       var layerM1 = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: 'EPSG:4326'
         })
       });
diff --git a/test/spec/ol/layer/layer.test.js b/test/spec/ol/layer/layer.test.js
index 3884d773c9..6b1af6b305 100644
--- a/test/spec/ol/layer/layer.test.js
+++ b/test/spec/ol/layer/layer.test.js
@@ -3,7 +3,7 @@ import _ol_Map_ from '../../../../src/ol/Map.js';
 import _ol_layer_Layer_ from '../../../../src/ol/layer/Layer.js';
 import {get as getProjection} from '../../../../src/ol/proj.js';
 import _ol_render_Event_ from '../../../../src/ol/render/Event.js';
-import _ol_source_Source_ from '../../../../src/ol/source/Source.js';
+import Source from '../../../../src/ol/source/Source.js';
 
 
 describe('ol.layer.Layer', function() {
@@ -14,7 +14,7 @@ describe('ol.layer.Layer', function() {
 
     beforeEach(function() {
       layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: getProjection('EPSG:4326')
         })
       });
@@ -64,7 +64,7 @@ describe('ol.layer.Layer', function() {
 
     it('accepts options', function() {
       var layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: getProjection('EPSG:4326')
         }),
         opacity: 0.5,
@@ -102,7 +102,7 @@ describe('ol.layer.Layer', function() {
 
     beforeEach(function() {
       layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: getProjection('EPSG:4326')
         })
       });
@@ -152,7 +152,7 @@ describe('ol.layer.Layer', function() {
 
     beforeEach(function() {
       layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: getProjection('EPSG:4326')
         })
       });
@@ -216,7 +216,7 @@ describe('ol.layer.Layer', function() {
   describe('#getSource', function() {
 
     it('gets the layer source', function() {
-      var source = new _ol_source_Source_({projection: getProjection('EPSG:4326')});
+      var source = new Source({projection: getProjection('EPSG:4326')});
       var layer = new _ol_layer_Layer_({source: source});
       expect(layer.getSource()).to.be(source);
     });
@@ -228,21 +228,21 @@ describe('ol.layer.Layer', function() {
 
     it('sets the layer source', function() {
       var layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({projection: projection})
+        source: new Source({projection: projection})
       });
 
-      var source = new _ol_source_Source_({projection: projection});
+      var source = new Source({projection: projection});
       layer.set('source', source);
       expect(layer.getSource()).to.be(source);
     });
 
     it('calls changed', function() {
       var layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({projection: projection})
+        source: new Source({projection: projection})
       });
       sinon.spy(layer, 'changed');
 
-      var source = new _ol_source_Source_({projection: projection});
+      var source = new Source({projection: projection});
       layer.set('source', source);
       expect(layer.changed.calledOnce).to.be(true);
     });
@@ -250,13 +250,13 @@ describe('ol.layer.Layer', function() {
     it('sets up event listeners', function() {
       sinon.spy(_ol_layer_Layer_.prototype, 'handleSourceChange_');
 
-      var first = new _ol_source_Source_({projection: projection});
+      var first = new Source({projection: projection});
       var layer = new _ol_layer_Layer_({source: first});
 
       first.setState('ready');
       expect(layer.handleSourceChange_.calledOnce).to.be(true);
 
-      var second = new _ol_source_Source_({projection: projection});
+      var second = new Source({projection: projection});
       layer.set('source', second);
 
       expect(layer.handleSourceChange_.calledOnce).to.be(true);
@@ -274,21 +274,21 @@ describe('ol.layer.Layer', function() {
 
     it('sets the layer source', function() {
       var layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({projection: projection})
+        source: new Source({projection: projection})
       });
 
-      var source = new _ol_source_Source_({projection: projection});
+      var source = new Source({projection: projection});
       layer.setSource(source);
       expect(layer.getSource()).to.be(source);
     });
 
     it('calls changed', function() {
       var layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({projection: projection})
+        source: new Source({projection: projection})
       });
       sinon.spy(layer, 'changed');
 
-      var source = new _ol_source_Source_({projection: projection});
+      var source = new Source({projection: projection});
       layer.setSource(source);
       expect(layer.changed.calledOnce).to.be(true);
     });
@@ -296,13 +296,13 @@ describe('ol.layer.Layer', function() {
     it('sets up event listeners', function() {
       sinon.spy(_ol_layer_Layer_.prototype, 'handleSourceChange_');
 
-      var first = new _ol_source_Source_({projection: projection});
+      var first = new Source({projection: projection});
       var layer = new _ol_layer_Layer_({source: first});
 
       first.setState('ready');
       expect(layer.handleSourceChange_.calledOnce).to.be(true);
 
-      var second = new _ol_source_Source_({projection: projection});
+      var second = new Source({projection: projection});
       layer.setSource(second);
 
       expect(layer.handleSourceChange_.calledOnce).to.be(true);
@@ -322,7 +322,7 @@ describe('ol.layer.Layer', function() {
 
     beforeEach(function() {
       layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: getProjection('EPSG:4326')
         })
       });
@@ -352,7 +352,7 @@ describe('ol.layer.Layer', function() {
     var layer;
     beforeEach(function() {
       layer = new _ol_layer_Layer_({
-        source: new _ol_source_Source_({
+        source: new Source({
           projection: getProjection('EPSG:4326')
         })
       });
diff --git a/test/spec/ol/source/cluster.test.js b/test/spec/ol/source/cluster.test.js
index 3779597d54..0034b10990 100644
--- a/test/spec/ol/source/cluster.test.js
+++ b/test/spec/ol/source/cluster.test.js
@@ -4,7 +4,7 @@ import Point from '../../../../src/ol/geom/Point.js';
 import Polygon from '../../../../src/ol/geom/Polygon.js';
 import {get as getProjection} from '../../../../src/ol/proj.js';
 import _ol_source_Cluster_ from '../../../../src/ol/source/Cluster.js';
-import _ol_source_Source_ from '../../../../src/ol/source/Source.js';
+import Source from '../../../../src/ol/source/Source.js';
 import _ol_source_Vector_ from '../../../../src/ol/source/Vector.js';
 
 describe('ol.source.Cluster', function() {
@@ -15,7 +15,7 @@ describe('ol.source.Cluster', function() {
         projection: getProjection('EPSG:4326'),
         source: new _ol_source_Vector_()
       });
-      expect(source).to.be.a(_ol_source_Source_);
+      expect(source).to.be.a(Source);
       expect(source).to.be.a(_ol_source_Cluster_);
       expect(source.getDistance()).to.be(20);
     });
diff --git a/test/spec/ol/source/raster.test.js b/test/spec/ol/source/raster.test.js
index e4a67f79d1..e2206490fb 100644
--- a/test/spec/ol/source/raster.test.js
+++ b/test/spec/ol/source/raster.test.js
@@ -5,7 +5,7 @@ import _ol_layer_Image_ from '../../../../src/ol/layer/Image.js';
 import _ol_proj_Projection_ from '../../../../src/ol/proj/Projection.js';
 import _ol_source_ImageStatic_ from '../../../../src/ol/source/ImageStatic.js';
 import _ol_source_Raster_ from '../../../../src/ol/source/Raster.js';
-import _ol_source_Source_ from '../../../../src/ol/source/Source.js';
+import Source from '../../../../src/ol/source/Source.js';
 import _ol_source_Tile_ from '../../../../src/ol/source/Tile.js';
 import _ol_source_XYZ_ from '../../../../src/ol/source/XYZ.js';
 
@@ -94,7 +94,7 @@ where('Uint8ClampedArray').describe('ol.source.Raster', function() {
         threads: 0,
         sources: [new _ol_source_Tile_({})]
       });
-      expect(source).to.be.a(_ol_source_Source_);
+      expect(source).to.be.a(Source);
       expect(source).to.be.a(_ol_source_Raster_);
     });
 
diff --git a/test/spec/ol/source/source.test.js b/test/spec/ol/source/source.test.js
index 59004d3a9e..e76b6e0c24 100644
--- a/test/spec/ol/source/source.test.js
+++ b/test/spec/ol/source/source.test.js
@@ -1,27 +1,27 @@
 import {get as getProjection} from '../../../../src/ol/proj.js';
-import _ol_source_Source_ from '../../../../src/ol/source/Source.js';
+import Source from '../../../../src/ol/source/Source.js';
 
 
 describe('ol.source.Source', function() {
 
   describe('constructor', function() {
     it('returns a source', function() {
-      var source = new _ol_source_Source_({
+      var source = new Source({
         projection: getProjection('EPSG:4326')
       });
-      expect(source).to.be.a(_ol_source_Source_);
+      expect(source).to.be.a(Source);
     });
   });
 
   describe('config option `attributions`', function() {
     it('accepts undefined', function() {
-      var source = new _ol_source_Source_({});
+      var source = new Source({});
       var attributions = source.getAttributions();
       expect(attributions).to.be(null);
     });
 
     it('accepts a single string', function() {
-      var source = new _ol_source_Source_({
+      var source = new Source({
         attributions: 'Humpty'
       });
       var attributions = source.getAttributions();
@@ -31,7 +31,7 @@ describe('ol.source.Source', function() {
     });
 
     it('accepts an array of strings', function() {
-      var source = new _ol_source_Source_({
+      var source = new Source({
         attributions: ['Humpty', 'Dumpty']
       });
       var attributions = source.getAttributions();
@@ -41,7 +41,7 @@ describe('ol.source.Source', function() {
     });
 
     it('accepts a function that returns a string', function() {
-      var source = new _ol_source_Source_({
+      var source = new Source({
         attributions: function() {
           return 'Humpty';
         }
@@ -53,7 +53,7 @@ describe('ol.source.Source', function() {
     });
 
     it('accepts a function that returns an array of strings', function() {
-      var source = new _ol_source_Source_({
+      var source = new Source({
         attributions: function() {
           return ['Humpty', 'Dumpty'];
         }
@@ -67,7 +67,7 @@ describe('ol.source.Source', function() {
 
   describe('#refresh()', function() {
     it('dispatches the change event', function() {
-      var source = new _ol_source_Source_({
+      var source = new Source({
         projection: getProjection('EPSG:4326')
       });
       var changedSpy = sinon.spy();
@@ -81,7 +81,7 @@ describe('ol.source.Source', function() {
     var source = null;
 
     beforeEach(function() {
-      source = new _ol_source_Source_({
+      source = new Source({
         attributions: 'before'
       });
     });
diff --git a/test/spec/ol/source/tile.test.js b/test/spec/ol/source/tile.test.js
index 1bdb607e5d..7b850bc1d4 100644
--- a/test/spec/ol/source/tile.test.js
+++ b/test/spec/ol/source/tile.test.js
@@ -3,7 +3,7 @@ import _ol_Tile_ from '../../../../src/ol/Tile.js';
 import TileRange from '../../../../src/ol/TileRange.js';
 import {get as getProjection} from '../../../../src/ol/proj.js';
 import _ol_proj_Projection_ from '../../../../src/ol/proj/Projection.js';
-import _ol_source_Source_ from '../../../../src/ol/source/Source.js';
+import Source from '../../../../src/ol/source/Source.js';
 import _ol_source_Tile_ from '../../../../src/ol/source/Tile.js';
 import _ol_tilecoord_ from '../../../../src/ol/tilecoord.js';
 import _ol_tilegrid_TileGrid_ from '../../../../src/ol/tilegrid/TileGrid.js';
@@ -59,7 +59,7 @@ describe('ol.source.Tile', function() {
       var source = new _ol_source_Tile_({
         projection: getProjection('EPSG:4326')
       });
-      expect(source).to.be.a(_ol_source_Source_);
+      expect(source).to.be.a(Source);
       expect(source).to.be.a(_ol_source_Tile_);
     });
     it('sets a custom cache size', function() {
diff --git a/test/spec/ol/source/tilejson.test.js b/test/spec/ol/source/tilejson.test.js
index 879f7628b2..b259d14402 100644
--- a/test/spec/ol/source/tilejson.test.js
+++ b/test/spec/ol/source/tilejson.test.js
@@ -1,4 +1,4 @@
-import _ol_source_Source_ from '../../../../src/ol/source/Source.js';
+import Source from '../../../../src/ol/source/Source.js';
 import _ol_source_TileJSON_ from '../../../../src/ol/source/TileJSON.js';
 import _ol_Observable_ from '../../../../src/ol/Observable.js';
 
@@ -11,7 +11,7 @@ describe('ol.source.TileJSON', function() {
       var source = new _ol_source_TileJSON_({
         url: 'spec/ol/data/tilejson.json'
       });
-      expect(source).to.be.a(_ol_source_Source_);
+      expect(source).to.be.a(Source);
       expect(source).to.be.a(_ol_source_TileJSON_);
     });
   });