diff --git a/src/openseadragon.js b/src/openseadragon.js
index 6eb8d09a..6df419a4 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -682,11 +682,15 @@
   * @returns {OpenSeadragon.Viewer}
   */
 window.OpenSeadragon = window.OpenSeadragon || function( options ){
-
     return new OpenSeadragon.Viewer( options );
-
 };
 
+if (typeof define === 'function' && define.amd) {
+   define(function () {
+       return (window.OpenSeadragon);
+   });
+}
+
 
 (function( $ ){