diff --git a/examples/overviewmap-custom.js b/examples/overviewmap-custom.js
index e3fe0926a4..abc13e842b 100644
--- a/examples/overviewmap-custom.js
+++ b/examples/overviewmap-custom.js
@@ -14,7 +14,7 @@ var overviewMapControl = new ol.control.OverviewMap({
   layers: [
     new ol.layer.Tile({
       source: new ol.source.OSM({
-        'url': 'https://{a-c}.tile.opencyclemap.org/cycle/{z}/{x}/{y}.png'
+        'url': 'http://{a-c}.tile.opencyclemap.org/cycle/{z}/{x}/{y}.png'
       })
     })
   ],