diff --git a/src/ol/source/vectorsource.js b/src/ol/source/vectorsource.js
index 96a3c5f4b1..985cb5bd64 100644
--- a/src/ol/source/vectorsource.js
+++ b/src/ol/source/vectorsource.js
@@ -224,7 +224,7 @@ ol.source.Vector.prototype.addFeatureInternal = function(feature) {
  */
 ol.source.Vector.prototype.setupChangeEvents_ = function(featureKey, feature) {
   goog.asserts.assert(!(featureKey in this.featureChangeKeys_),
-      'key (%s) not yet registered in featurChangeKey', featureKey);
+      'key (%s) not yet registered in featureChangeKey', featureKey);
   this.featureChangeKeys_[featureKey] = [
     goog.events.listen(feature,
         goog.events.EventType.CHANGE,