diff --git a/migrations/nixos-mailserver-migration-03.py b/migrations/nixos-mailserver-migration-03.py
index 6aedad4..ead6df1 100644
--- a/migrations/nixos-mailserver-migration-03.py
+++ b/migrations/nixos-mailserver-migration-03.py
@@ -39,7 +39,7 @@ def check_user(vmail_root: Path):
 
 def is_maildir_related(path: Path, layout: FolderLayout) -> bool:
     if path.name in [
-        "subscriptions"
+        "subscriptions",
         # https://doc.dovecot.org/2.3/admin_manual/mailbox_formats/maildir/#imap-uid-mapping
         "dovecot-uidlist",
         # https://doc.dovecot.org/2.3/admin_manual/mailbox_formats/maildir/#imap-keywords