diff --git a/examples/tissot.js b/examples/tissot.js
index 1c0b74706f..13bcbaeb17 100644
--- a/examples/tissot.js
+++ b/examples/tissot.js
@@ -1,12 +1,12 @@
 goog.require('ol.Feature');
 goog.require('ol.Map');
+goog.require('ol.Sphere');
 goog.require('ol.View');
 goog.require('ol.geom.Polygon');
 goog.require('ol.layer.Tile');
 goog.require('ol.layer.Vector');
 goog.require('ol.source.TileWMS');
 goog.require('ol.source.Vector');
-goog.require('ol.sphere.WGS84');
 
 var vectorSource = new ol.source.Vector();
 
@@ -33,11 +33,12 @@ var map = new ol.Map({
   })
 });
 
+var wgs84Sphere = new ol.Sphere(6378137);
 
 var radius = 800000;
 for (var x = -180; x < 180; x += 30) {
   for (var y = -90; y < 90; y += 30) {
-    var circle = ol.geom.Polygon.circular(ol.sphere.WGS84, [x, y], radius, 64);
+    var circle = ol.geom.Polygon.circular(wgs84Sphere, [x, y], radius, 64);
     vectorSource.addFeature(new ol.Feature(circle));
   }
 }