diff --git a/data/imagery.json b/data/imagery.json
index b1c9998e8..ffd17b187 100644
--- a/data/imagery.json
+++ b/data/imagery.json
@@ -42137,6 +42137,7 @@
       "name": "MTBmap.no",
       "type": "tms",
       "template": "https://mtbmap.no/tiles/osm/mtbmap/{zoom}/{x}/{y}.jpg",
+      "tileSize": 512,
       "zoomExtent": [3, 14],
       "polygon": [
         [
diff --git a/data/update_imagery.js b/data/update_imagery.js
index 4375f5d3f..86818c8c8 100644
--- a/data/update_imagery.js
+++ b/data/update_imagery.js
@@ -96,6 +96,8 @@ sources.concat(whitelist).forEach(function(source) {
     if (source.id === 'Mapbox') {
         im.template = im.template.replace('.jpg', '@2x.jpg');
         im.tileSize = 512;
+    } else if (source.id === 'mtbmap-no') {
+        im.tileSize = 512;
     }
 
     if (source.type === 'wms') {