diff --git a/examples/modify-features.js b/examples/modify-features.js
index d6254dca68..ff1dd250a5 100644
--- a/examples/modify-features.js
+++ b/examples/modify-features.js
@@ -1,3 +1,4 @@
+goog.require('ol.Collection');
 goog.require('ol.Map');
 goog.require('ol.View2D');
 goog.require('ol.interaction');