diff --git a/src/ol/source/vectorsource.js b/src/ol/source/vectorsource.js
index 776dd2f7b2..d002278ebb 100644
--- a/src/ol/source/vectorsource.js
+++ b/src/ol/source/vectorsource.js
@@ -212,6 +212,14 @@ ol.source.Vector.prototype.getClosestFeatureToCoordinate =
 };
 
 
+/**
+ * @return {ol.Extent} Extent.
+ */
+ol.source.Vector.prototype.getExtent = function() {
+  return this.rBush_.getExtent();
+};
+
+
 /**
  * @param {goog.events.Event} event Event.
  * @private