diff --git a/src/ol/base/store.js b/src/ol/base/store.js
index 44bb41b179..58b55d267b 100644
--- a/src/ol/base/store.js
+++ b/src/ol/base/store.js
@@ -1,5 +1,6 @@
 goog.provide('ol.Store');
 
+goog.require('goog.functions');
 goog.require('ol.Extent');
 goog.require('ol.Projection');
 
@@ -59,6 +60,12 @@ ol.Store.prototype.getProjection = function() {
 ol.Store.prototype.getResolutions = goog.abstractMethod;
 
 
+/**
+ * @return {boolean} Is ready.
+ */
+ol.Store.prototype.isReady = goog.functions.TRUE;
+
+
 /**
  * @param {string|undefined} attribution Attribution.
  */