diff --git a/lib/layer/format/tiles.mjs b/lib/layer/format/tiles.mjs
index d76d1cba5..62af5a7bc 100644
--- a/lib/layer/format/tiles.mjs
+++ b/lib/layer/format/tiles.mjs
@@ -1,10 +1,14 @@
 export default layer => {
 
+  layer.source ??= 'OSM'
+
+  layer.projection ??= 'EPSG:3857'
+
   layer.L = new ol.layer.Tile({
-    source: new ol.source.OSM({
+    source: new ol.source[layer.source]({
+      projection: layer.projection,
       url: decodeURIComponent(layer.URI),
-      opaque: false,
-      transition: 0,
+      transition: 0
     }),
     layer: layer,
     zIndex: layer.style?.zIndex || 0