diff --git a/src/accounting/account/commands.py b/src/accounting/account/commands.py
index f30c80a..df751d0 100644
--- a/src/accounting/account/commands.py
+++ b/src/accounting/account/commands.py
@@ -1,7 +1,7 @@
 # The Mia! Accounting Project.
 # Author: imacat@mail.imacat.idv.tw (imacat), 2023/1/30
 
-#  Copyright (c) 2023 imacat.
+#  Copyright (c) 2023-2024 imacat.
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -27,7 +27,7 @@ from accounting import db
 from accounting.models import BaseAccount, Account, AccountL10n
 from accounting.utils.user import get_user_pk
 
-AccountData = tuple[int, str, int, str, str, str, bool]
+type AccountData = tuple[int, str, int, str, str, str, bool]
 """The format of the account data, as a list of (ID, base account code, number,
 English, Traditional Chinese, Simplified Chinese, is-need-offset) tuples."""
 
diff --git a/src/accounting/utils/user.py b/src/accounting/utils/user.py
index a0168e4..d6d3b87 100644
--- a/src/accounting/utils/user.py
+++ b/src/accounting/utils/user.py
@@ -1,7 +1,7 @@
 # The Mia! Accounting Project.
 # Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/1
 
-#  Copyright (c) 2023 imacat.
+#  Copyright (c) 2023-2024 imacat.
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -113,7 +113,7 @@ class UserUtilityInterface(Generic[T], ABC):
 
 __user_utils: UserUtilityInterface
 """The user utilities."""
-user_cls: Type[Model] = Model
+type user_cls = Model
 """The user class."""
 user_pk_column: sa.Column = sa.Column(sa.Integer)
 """The primary key column of the user class."""