diff --git a/src/ol/parser/topojson.js b/src/ol/parser/topojson.js
index baedc9cdfe..a6221782ca 100644
--- a/src/ol/parser/topojson.js
+++ b/src/ol/parser/topojson.js
@@ -74,7 +74,7 @@ ol.parser.TopoJSON.prototype.concatenateArcs_ = function(indices, arcs) {
  */
 ol.parser.TopoJSON.prototype.read = function(str) {
   var topology = /** @type {TopoJSONTopology} */ (JSON.parse(str));
-  return this.readFeaturesFromObject(topology);
+  return this.readFeaturesFromObject(topology).features;
 };
 
 
@@ -83,7 +83,7 @@ ol.parser.TopoJSON.prototype.read = function(str) {
  *
  * @param {string} str TopoJSON topology string.
  * @param {ol.parser.ReadFeaturesOptions=} opt_options Reader options.
- * @return {Array.<ol.Feature>} Array of features.
+ * @return {ol.parser.ReadFeaturesResult} Features and metadata.
  */
 ol.parser.TopoJSON.prototype.readFeaturesFromString =
     function(str, opt_options) {
@@ -91,7 +91,8 @@ ol.parser.TopoJSON.prototype.readFeaturesFromString =
   if (topology.type !== 'Topology') {
     throw new Error('Not a "Topology" type object');
   }
-  return this.readFeaturesFromTopology_(topology, opt_options);
+  return {features: this.readFeaturesFromTopology_(topology, opt_options),
+    metadata: {projection: 'EPSG:4326'}};
 };
 
 
@@ -100,14 +101,15 @@ ol.parser.TopoJSON.prototype.readFeaturesFromString =
  *
  * @param {TopoJSONTopology} topology TopoJSON topology object.
  * @param {ol.parser.ReadFeaturesOptions=} opt_options Reader options.
- * @return {Array.<ol.Feature>} Array of features.
+ * @return {ol.parser.ReadFeaturesResult} Features and metadata.
  */
 ol.parser.TopoJSON.prototype.readFeaturesFromObject =
     function(topology, opt_options) {
   if (topology.type !== 'Topology') {
     throw new Error('Not a "Topology" type object');
   }
-  return this.readFeaturesFromTopology_(topology, opt_options);
+  return {features: this.readFeaturesFromTopology_(topology, opt_options),
+    metadata: {projection: 'EPSG:4326'}};
 };
 
 
diff --git a/test/spec/ol/parser/topojson.test.js b/test/spec/ol/parser/topojson.test.js
index b02a112a0b..aa80cf2d28 100644
--- a/test/spec/ol/parser/topojson.test.js
+++ b/test/spec/ol/parser/topojson.test.js
@@ -79,13 +79,13 @@ describe('ol.parser.TopoJSON', function() {
         };
 
         var result = parser.readFeaturesFromString(text, {callback: callback});
-        expect(result.length).to.be(178);
+        expect(result.features.length).to.be(178);
 
         expect(pointVertices.coordinates.length).to.be(0);
         expect(lineVertices.coordinates.length).to.be(0);
         expect(polygonVertices.coordinates.length).to.be(31400);
 
-        var first = result[0];
+        var first = result.features[0];
         expect(first).to.be.a(ol.Feature);
         var firstGeom = first.getGeometry();
         expect(firstGeom).to.be.a(ol.geom.MultiPolygon);
@@ -93,7 +93,7 @@ describe('ol.parser.TopoJSON', function() {
           -180, 180, -85.60903777459777, 83.64513000000002
         ]);
 
-        var last = result[177];
+        var last = result.features[177];
         expect(last).to.be.a(ol.Feature);
         var lastGeom = last.getGeometry();
         expect(lastGeom).to.be.a(ol.geom.Polygon);