diff --git a/coverage/fuel3.html b/coverage/fuel3.html
index 94aa0f9..a9e7eb9 100644
--- a/coverage/fuel3.html
+++ b/coverage/fuel3.html
@@ -95,7 +95,9 @@
 </script>
 <script type="text/javascript">
     const ort = new ol.layer.Tile({
-        source: new ol.source.OSM(),
+        source: new ol.source.OSM({
+            "url": "http://tiles.wmflabs.org/bw-mapnik/{z}/{x}/{y}.png"
+        }),
         title: "OpenStreetMap std",
         visible: true
     });