diff --git a/src/ol/source/clustersource.js b/src/ol/source/clustersource.js
index a9a83b9847..cb5225c4ea 100644
--- a/src/ol/source/clustersource.js
+++ b/src/ol/source/clustersource.js
@@ -60,13 +60,14 @@ goog.inherits(ol.source.Cluster, ol.source.Vector);
 
 
 /**
- * @param {ol.Extent} extent
- * @param {number} resolution
+ * @inheritDoc
  */
-ol.source.Cluster.prototype.loadFeatures = function(extent, resolution) {
+ol.source.Cluster.prototype.loadFeatures = function(extent, resolution,
+    projection) {
   if (resolution !== this.resolution_) {
     this.clear();
     this.resolution_ = resolution;
+    this.source_.loadFeatures(extent, resolution, projection);
     this.cluster_();
     this.addFeatures(this.features_);
   }