diff --git a/boxes/generators/traylayout.py b/boxes/generators/traylayout.py
index c42279b..e439616 100644
--- a/boxes/generators/traylayout.py
+++ b/boxes/generators/traylayout.py
@@ -98,7 +98,7 @@ class TrayLayout2(TrayLayout):
             self.layout = None
         else:
             self.argparser.add_argument(
-                "--layout", action="store", type=str)
+                "--layout", action="store", type=str, default="")
 
     # Use normal open and close
     open = Boxes.open