diff --git a/singer_sdk/helpers/_flattening.py b/singer_sdk/helpers/_flattening.py
index 58ed68ab3..e188e59e1 100644
--- a/singer_sdk/helpers/_flattening.py
+++ b/singer_sdk/helpers/_flattening.py
@@ -379,7 +379,9 @@ def flatten_record(
         A flattened version of the record.
     """
     if (flattened_schema is not None) or (max_level is not None):
-        raise InvalidFlatteningRecordsParameter("flattened_schema or max_level must be provided")
+        raise InvalidFlatteningRecordsParameter(
+            "flattened_schema or max_level must be provided"
+        )
     max_level = max_level or 0
 
     return _flatten_record(
diff --git a/tests/core/test_flattening.py b/tests/core/test_flattening.py
index f62afd02d..37e63ff6b 100644
--- a/tests/core/test_flattening.py
+++ b/tests/core/test_flattening.py
@@ -39,7 +39,11 @@
             id="flattened schema not provided",
         ),
         pytest.param(
-            None, None, None, InvalidFlatteningRecordsParameter, id="no schema or max level provided"
+            None,
+            None,
+            None,
+            InvalidFlatteningRecordsParameter,
+            id="no schema or max level provided",
         ),
     ],
 )