diff --git a/public/assets/sunny.json b/public/assets/sunny.json
index 14c3159a6b..595fb0edf0 100644
--- a/public/assets/sunny.json
+++ b/public/assets/sunny.json
@@ -7,7 +7,7 @@
       "attribution": "<a href=\"https://github.com/protomaps/basemaps\">Protomaps</a> © <a href=\"https://openstreetmap.org\">OpenStreetMap</a>",
       "type": "vector",
       "tiles": [
-        "https://mapcomplete.org/service-worker/offline-basemap/{z}-{x}-{y}.mvt?fallback=true&auto=true"
+        "./service-worker/offline-basemap/{z}-{x}-{y}.mvt?fallback=true&auto=true"
       ],
       "maxzoom": 15,
       "minzoom": 0