1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 1abc8875cb..d7f226d589 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -437,10 +437,10 @@ class RegistrationHandler(BaseHandler):
 
                 if RoomAlias.is_valid(r):
                     (
-                        room_id,
+                        room,
                         remote_room_hosts,
                     ) = await room_member_handler.lookup_room_alias(room_alias)
-                    room_id = room_id.to_string()
+                    room_id = room.to_string()
                 else:
                     raise SynapseError(
                         400, "%s was not legal room ID or room alias" % (r,)