diff --git a/src/ol/geom/flat/closest.js b/src/ol/geom/flat/closest.js
index 6686ad9a2f..cf11eb5d12 100644
--- a/src/ol/geom/flat/closest.js
+++ b/src/ol/geom/flat/closest.js
@@ -1,5 +1,6 @@
 goog.provide('ol.geom.flat.closest');
 
+goog.require('ol');
 goog.require('ol.math');