diff --git a/devices.py b/devices.py
index 30fd405..1cbcbbd 100644
--- a/devices.py
+++ b/devices.py
@@ -121,6 +121,7 @@ class FrappyConfig(Device):
                 aliasdev = session.devices.get(aliasname)
                 if aliasdev:
                     result[aliasname] = aliasdev
+        return result
 
     def set_envlist(self):
         """create aliases for SECoP devices