diff --git a/pycroft/model/finance.py b/pycroft/model/finance.py
index d2bc51058..8a26afb57 100644
--- a/pycroft/model/finance.py
+++ b/pycroft/model/finance.py
@@ -339,7 +339,7 @@ def check_split_on_update(mapper, connection, target):
 class BankAccount(IntegerIdModel):
     name: Mapped[str255]
     bank: Mapped[str255]
-    owner: Mapped[str255 | None]
+    owner: Mapped[str255]
     account_number: Mapped[str] = mapped_column(String(10))
     routing_number: Mapped[str] = mapped_column(String(8))
     iban: Mapped[str] = mapped_column(String(34))