diff --git a/nebula/manager.py b/nebula/manager.py
index 816bd77..fc566aa 100644
--- a/nebula/manager.py
+++ b/nebula/manager.py
@@ -117,7 +117,7 @@ def __init__(  # noqa:C901
         #         yamlfilename=self.configfilename, board_name=board_name
         #     )
         # else:
-        #     self.usbsdmux = None
+        self.usbsdmux = None
 
         self.help = helper()
         self.usbdev = usbdev()