diff --git a/src/ol/tilecoord.js b/src/ol/tilecoord.js
index 521ab2dfd3..3c33f24e78 100644
--- a/src/ol/tilecoord.js
+++ b/src/ol/tilecoord.js
@@ -1,5 +1,7 @@
 goog.provide('ol.tilecoord');
 
+goog.require('ol');
+
 
 /**
  * @param {string} str String that follows pattern “z/x/y” where x, y and z are