diff --git a/tests/test_mapping_policies.py b/tests/test_mapping_policies.py
index 6b6ae8e..db67e71 100644
--- a/tests/test_mapping_policies.py
+++ b/tests/test_mapping_policies.py
@@ -137,9 +137,7 @@ def func(alpha: int = 1, *, beta: int = 2) -> str:
 
 
 # TODO: remove in v.0.33 if it happens, otherwise in v1.0.
-def test_positional_with_defaults_without_kwonly__no_explicit_policy() -> (
-    None
-):
+def test_positional_with_defaults_without_kwonly__no_explicit_policy() -> None:
     def func(alpha: str, beta: int = 1) -> str:
         return f"{alpha} {beta}"