diff --git a/public/templates/data.tmpl b/public/templates/data.tmpl
index 7aa3ddf..06d4938 100644
--- a/public/templates/data.tmpl
+++ b/public/templates/data.tmpl
@@ -124,6 +124,7 @@
 
         for (tile_url in tile_urls) {
             L.tileLayer(tile_urls[tile_url], {
+                tileSize: 256,
                 minZoom: tile_minzoom,
                 maxZoom: tile_maxzoom,
                 attribution: tile_attribution