diff --git a/src/App.tsx b/src/App.tsx
index 5f75b8a..2c5e58b 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -36,10 +36,9 @@ const App: React.FC = () => (
diff --git a/src/components/map/Map.tsx b/src/components/map/Map.tsx
index 2c7f77f..e361775 100644
--- a/src/components/map/Map.tsx
+++ b/src/components/map/Map.tsx
@@ -8,7 +8,7 @@ import { lon2tile, lat2tile } from '../../lib/geo';
export interface MapProperties {
scope: MapScope;
- numberOfTiledLayers: number;
+ numberOfTiledLayers?: number;
}
/**