diff --git a/src/api/layer/osm.js b/src/api/layer/osm.js
index 87e37c5db7..7d8d31b95d 100644
--- a/src/api/layer/osm.js
+++ b/src/api/layer/osm.js
@@ -1,5 +1,7 @@
 goog.provide('ol.layer.osm');
 
+goog.require('ol.layer.OSM');
+
 /**
  * @export
  * @return {ol.layer.OSM}
diff --git a/src/api/layer/xyz.js b/src/api/layer/xyz.js
index 4f5a051a9c..49967e62cf 100644
--- a/src/api/layer/xyz.js
+++ b/src/api/layer/xyz.js
@@ -1,5 +1,7 @@
 goog.provide('ol.layer.xyz');
 
+goog.require('ol.layer.XYZ');
+
 /**
  * @export
  * @param {Object} opt_arg Config object.