diff --git a/umap/static/umap/js/umap.js b/umap/static/umap/js/umap.js
index b055dbf2..c814854e 100644
--- a/umap/static/umap/js/umap.js
+++ b/umap/static/umap/js/umap.js
@@ -651,8 +651,18 @@ L.U.Map.include({
   },
 
   eachTileLayer: function (callback, context) {
-    if (this.customTilelayer) callback.call(context, this.customTilelayer)
-    this.tilelayers.forEach((layer) => callback.call(context, layer))
+    const urls = []
+    const callOne = (layer) => {
+      // Prevent adding a duplicate background,
+      // while adding selected/custom on top of the list
+      const url = layer.options.url_template
+      if (urls.indexOf(url) !== -1) return
+      callback.call(context, layer)
+      urls.push(url)
+    }
+    if (this.selected_tilelayer) callOne(this.selected_tilelayer)
+    if (this.customTilelayer) callOne(this.customTilelayer)
+    this.tilelayers.forEach(callOne)
   },
 
   setOverlay: function () {