diff --git a/examples/geojson.js b/examples/geojson.js
index 247ec4d9f2..176f0b46d4 100644
--- a/examples/geojson.js
+++ b/examples/geojson.js
@@ -44,7 +44,7 @@ var styleFunction = function(feature) {
 };
 
 var vectorSource = new ol.source.Vector();
-ol.format.GeoJSON.readObject({
+new ol.format.GeoJSON().readObject({
   'type': 'FeatureCollection',
   'features': [
     {
diff --git a/src/ol/format/geojson/geojsonformat.js b/src/ol/format/geojson/geojsonformat.js
index 3b1b51085e..39bc2b311a 100644
--- a/src/ol/format/geojson/geojsonformat.js
+++ b/src/ol/format/geojson/geojsonformat.js
@@ -7,6 +7,7 @@ goog.provide('ol.format.GeoJSON');
 goog.require('goog.asserts');
 goog.require('goog.json');
 goog.require('ol.Feature');
+goog.require('ol.format.IReader');
 goog.require('ol.geom.LineString');
 goog.require('ol.geom.MultiLineString');
 goog.require('ol.geom.MultiPolygon');
@@ -17,6 +18,7 @@ goog.require('ol.geom.Polygon');
 
 /**
  * @constructor
+ * @implements {ol.format.IReader}
  */
 ol.format.GeoJSON = function() {
 };
@@ -124,30 +126,21 @@ ol.format.GeoJSON.readFeatureCollection_ = function(object, callback, opt_obj) {
 
 
 /**
- * @param {GeoJSONObject} object Object.
- * @param {function(this: S, ol.Feature): T} callback Callback.
- * @param {S=} opt_obj Scope.
- * @return {T} Callback result.
- * @template S,T
+ * @inheritDoc
  */
-ol.format.GeoJSON.readObject = function(object, callback, opt_obj) {
-  var objectReader = ol.format.GeoJSON.OBJECT_READERS_[object.type];
+ol.format.GeoJSON.prototype.readObject = function(object, callback, opt_obj) {
+  var geoJSONObject = /** @type {GeoJSONObject} */ (object);
+  var objectReader = ol.format.GeoJSON.OBJECT_READERS_[geoJSONObject.type];
   goog.asserts.assert(goog.isDef(objectReader));
-  return objectReader(object, callback, opt_obj);
+  return objectReader(geoJSONObject, callback, opt_obj);
 };
 
 
 /**
- * @param {string} string String.
- * @param {function(ol.Feature): T} callback Callback.
- * @param {S=} opt_obj Scope.
- * @return {T} Callback result.
- * @template S,T
+ * @inheritDoc
  */
-ol.format.GeoJSON.readString = function(string, callback, opt_obj) {
-  var object = goog.json.parse(string);
-  return ol.format.GeoJSON.readObject(
-      /** @type {GeoJSONObject} */ (object), callback);
+ol.format.GeoJSON.prototype.readString = function(string, callback, opt_obj) {
+  return this.readObject(goog.json.parse(string), callback, opt_obj);
 };
 
 
diff --git a/test/spec/ol/format/geojsonformat.test.js b/test/spec/ol/format/geojsonformat.test.js
index 88fb403766..d088fd3591 100644
--- a/test/spec/ol/format/geojsonformat.test.js
+++ b/test/spec/ol/format/geojsonformat.test.js
@@ -47,10 +47,12 @@ describe('ol.format.GeoJSON', function() {
     'features': [pointGeoJSON, lineStringGeoJSON, polygonGeoJSON]
   };
 
+  var format = new ol.format.GeoJSON();
+
   describe('readObject', function() {
 
     it('can read a single point feature', function() {
-      var feature = ol.format.GeoJSON.readObject(pointGeoJSON, function(f) {
+      var feature = format.readObject(pointGeoJSON, function(f) {
         return f;
       });
       expect(feature).to.be.an(ol.Feature);
@@ -61,7 +63,7 @@ describe('ol.format.GeoJSON', function() {
     });
 
     it('can read a single line string feature', function() {
-      var feature = ol.format.GeoJSON.readObject(lineStringGeoJSON,
+      var feature = format.readObject(lineStringGeoJSON,
           function(f) {
             return f;
           });
@@ -75,7 +77,7 @@ describe('ol.format.GeoJSON', function() {
     });
 
     it('can read a single polygon feature', function() {
-      var feature = ol.format.GeoJSON.readObject(polygonGeoJSON, function(f) {
+      var feature = format.readObject(polygonGeoJSON, function(f) {
         return f;
       });
       expect(feature).to.be.an(ol.Feature);
@@ -90,7 +92,7 @@ describe('ol.format.GeoJSON', function() {
 
     it('can read a feature collection', function() {
       var features = [];
-      ol.format.GeoJSON.readObject(featureCollectionGeoJSON, function(f) {
+      format.readObject(featureCollectionGeoJSON, function(f) {
         features.push(f);
       });
       expect(features).to.have.length(3);