diff --git a/src/editor/model/Editor.js b/src/editor/model/Editor.js
index e8a4f8b37..964944f2e 100644
--- a/src/editor/model/Editor.js
+++ b/src/editor/model/Editor.js
@@ -16,7 +16,7 @@ const deps = [
   require('utils'),
   require('i18n'),
   // require('keymaps'),
-  // // require('undo_manager'),
+  require('undo_manager'),
   require('storage_manager'),
   require('device_manager'),
   require('parser'),