diff --git a/pycroft/lib/finance/repayment/fields.py b/pycroft/lib/finance/repayment/fields.py
index 5c9aecc7e..e890ecabd 100644
--- a/pycroft/lib/finance/repayment/fields.py
+++ b/pycroft/lib/finance/repayment/fields.py
@@ -7,7 +7,7 @@ class IBANField(fields.Field):
     to a string.
     """
 
-    def _deserialize(self, value, attr, data, **kwargs) -> IBAN:
+    def _deserialize(self, value, attr, data, **kwargs):
         try:
             return IBAN(value, validate_bban=True)
         except ValueError as error:
diff --git a/web/api/v0/__init__.py b/web/api/v0/__init__.py
index 9cf535174..6e3ceccca 100644
--- a/web/api/v0/__init__.py
+++ b/web/api/v0/__init__.py
@@ -812,7 +812,9 @@ def get(self, user_id: int) -> Response:
         },
         location="form",
     )
-    def post(self, user_id: int, beneficiary: str, iban: str, amount: Decimal) -> Response:
+    def post(
+        self, user_id: int, beneficiary: str, iban: str, amount: Decimal
+    ) -> Response:
         current_app.logger.warning({beneficiary, iban, amount})
         return jsonify({"success": True})