diff --git a/src/ol/geom/flat/deflate.js b/src/ol/geom/flat/deflate.js
index bb59f67e5e..b56db32678 100644
--- a/src/ol/geom/flat/deflate.js
+++ b/src/ol/geom/flat/deflate.js
@@ -1,5 +1,7 @@
 goog.provide('ol.geom.flat.deflate');
 
+goog.require('ol');
+
 
 /**
  * @param {Array.<number>} flatCoordinates Flat coordinates.