diff --git a/types/leaflet-providers/index.d.ts b/types/leaflet-providers/index.d.ts
index bc9a4576de..c92eeea96f 100644
--- a/types/leaflet-providers/index.d.ts
+++ b/types/leaflet-providers/index.d.ts
@@ -9,7 +9,7 @@ import * as L from 'leaflet';
 declare module 'leaflet' {
   namespace TileLayer {
     class Provider extends TileLayer {
-      constructor(provider: string, options?: TileLayerOptions)
+      constructor(provider: string, options?: TileLayerOptions & { [name: string]: string; })
     }
 
     namespace Provider {
@@ -28,6 +28,6 @@ declare module 'leaflet' {
   }
 
   namespace tileLayer {
-    function provider(provider: string, options?: TileLayerOptions): TileLayer.Provider;
+    function provider(provider: string, options?: TileLayerOptions & { [name: string]: string; }): TileLayer.Provider;
   }
 }