diff --git a/examples/rtree.js b/examples/rtree.js
index 92d1843330..e3eed471e9 100644
--- a/examples/rtree.js
+++ b/examples/rtree.js
@@ -11,6 +11,8 @@ goog.require('ol.layer.Vector');
 goog.require('ol.shape');
 goog.require('ol.source.Vector');
 goog.require('ol.structs.RTree');
+goog.require('ol.style.Stroke');
+goog.require('ol.style.Style');
 
 
 /**
@@ -57,9 +59,10 @@ var vectorSource = new ol.source.Vector({
   features: features
 });
 
-var style = {
-  image: ol.shape.renderCircle(3, null, {color: 'red', width: 1})
-};
+var style = new ol.style.Style({
+  image: ol.shape.renderCircle(3, null,
+      new ol.style.Stroke({color: 'red', width: 1}))
+});
 
 var colors = ['red', 'orange', 'yellow', 'blue', 'green', 'indigo', 'violet'];
 var depthStyle = [];