diff --git a/src/gridstack.js b/src/gridstack.js
index 4afdcfc6b..af58c3e21 100644
--- a/src/gridstack.js
+++ b/src/gridstack.js
@@ -5,7 +5,7 @@
 
 (function (factory) {
     if (typeof define === 'function' && define.amd) {
-        define(['jquery', 'lodash'], factory);
+        define(['jquery', 'lodash', 'jquery-ui/core', 'jquery-ui/widget', 'jquery-ui/mouse', 'jquery-ui/draggable', 'jquery-ui/resizable'], factory);
     }
     else {
         factory(jQuery, _);