diff --git a/TileLayer.Grayscale.js b/TileLayer.Grayscale.js
index 3dc32b4..1dae67c 100644
--- a/TileLayer.Grayscale.js
+++ b/TileLayer.Grayscale.js
@@ -14,6 +14,7 @@ L.TileLayer.Grayscale = L.TileLayer.extend({
 	},
 
 	initialize: function (url, options) {
+		options = options || {}
 		options.crossOrigin = true;
 		L.TileLayer.prototype.initialize.call(this, url, options);