diff --git a/src/ol/webgl/tilelayerrenderer.js b/src/ol/webgl/tilelayerrenderer.js
index cd2d82ccaf..0885c82d8a 100644
--- a/src/ol/webgl/tilelayerrenderer.js
+++ b/src/ol/webgl/tilelayerrenderer.js
@@ -12,6 +12,7 @@ goog.require('goog.asserts');
 goog.require('goog.events.EventType');
 goog.require('goog.object');
 goog.require('goog.vec.Mat4');
+goog.require('goog.vec.Vec4');
 goog.require('goog.webgl');
 goog.require('ol.Coordinate');
 goog.require('ol.Size');