diff --git a/src/ol/geom/flat/intersectsextent.js b/src/ol/geom/flat/intersectsextent.js
index 03381628f9..e1fa9332af 100644
--- a/src/ol/geom/flat/intersectsextent.js
+++ b/src/ol/geom/flat/intersectsextent.js
@@ -1,5 +1,6 @@
 goog.provide('ol.geom.flat.intersectsextent');
 
+goog.require('ol');
 goog.require('ol.extent');
 goog.require('ol.geom.flat.contains');
 goog.require('ol.geom.flat.segments');