diff --git a/mautrix_telegram/scripts/dbms_migrate/__main__.py b/mautrix_telegram/scripts/dbms_migrate/__main__.py
index e9edfffd..72dc1ce6 100644
--- a/mautrix_telegram/scripts/dbms_migrate/__main__.py
+++ b/mautrix_telegram/scripts/dbms_migrate/__main__.py
@@ -23,7 +23,6 @@ def log(message, end="\n"):
 
 def connect(to):
     import mautrix_telegram.db.base as base
-    base.Base = declarative_base(cls=base.BaseBase)
     from mautrix_telegram.db import (Portal, Message, UserPortal, User, RoomState, UserProfile,
                                      Contact, Puppet, BotChat, TelegramFile)
     db_engine = sql.create_engine(to)