diff --git a/src/ol/structs/lrucache.js b/src/ol/structs/lrucache.js
index 16f902d5cd..dd226e5186 100644
--- a/src/ol/structs/lrucache.js
+++ b/src/ol/structs/lrucache.js
@@ -1,5 +1,6 @@
 goog.provide('ol.structs.LRUCache');
 
+goog.require('ol');
 goog.require('ol.asserts');
 goog.require('ol.obj');