diff --git a/src/ol/format/wmscapabilitiesformat.js b/src/ol/format/wmscapabilitiesformat.js
index b9ae3f5bb5..1ee65a4067 100644
--- a/src/ol/format/wmscapabilitiesformat.js
+++ b/src/ol/format/wmscapabilitiesformat.js
@@ -2,7 +2,6 @@ goog.provide('ol.format.WMSCapabilities');
 
 goog.require('goog.asserts');
 goog.require('goog.dom.NodeType');
-goog.require('goog.object');
 goog.require('ol');
 goog.require('ol.format.XLink');
 goog.require('ol.format.XML');
@@ -339,9 +338,8 @@ ol.format.WMSCapabilities.readLayer_ = function(node, objectStack) {
   var addKeys = ['Style', 'CRS', 'AuthorityURL'];
   addKeys.forEach(function(key) {
     if (key in parentLayerObject) {
-      var childValue = goog.object.setIfUndefined(layerObject, key, []);
-      childValue = childValue.concat(parentLayerObject[key]);
-      layerObject[key] = childValue;
+      var childValue = layerObject[key] || [];
+      layerObject[key] = childValue.concat(parentLayerObject[key]);
     }
   });
 
diff --git a/src/ol/xml.js b/src/ol/xml.js
index 780a9be248..2d86b031b5 100644
--- a/src/ol/xml.js
+++ b/src/ol/xml.js
@@ -3,7 +3,6 @@ goog.provide('ol.xml');
 goog.require('goog.asserts');
 goog.require('goog.dom.NodeType');
 goog.require('goog.dom.xml');
-goog.require('goog.object');
 goog.require('goog.userAgent');
 goog.require('ol.array');
 
@@ -454,7 +453,12 @@ ol.xml.makeObjectPropertyPusher = function(valueReader, opt_property, opt_this)
               opt_property : node.localName;
           goog.asserts.assert(goog.isObject(object),
               'entity from stack was not an object');
-          var array = goog.object.setIfUndefined(object, property, []);
+          var array;
+          if (property in object) {
+            array = object[property];
+          } else {
+            array = object[property] = [];
+          }
           array.push(value);
         }
       });