diff --git a/multidict/_multidict_py.py b/multidict/_multidict_py.py
index 79c45aa19..dc26a3eac 100644
--- a/multidict/_multidict_py.py
+++ b/multidict/_multidict_py.py
@@ -16,7 +16,6 @@ def GenericAlias(cls):
 
 
 class istr(str):
-
     """Case insensitive str."""
 
     __is_istr__ = True
diff --git a/tests/test_multidict_benchmarks.py b/tests/test_multidict_benchmarks.py
index a1ba8dac2..539dca037 100644
--- a/tests/test_multidict_benchmarks.py
+++ b/tests/test_multidict_benchmarks.py
@@ -1,7 +1,9 @@
 """codspeed benchmarks for multidict."""
 
+from typing import Dict, Union
+
 from pytest_codspeed import BenchmarkFixture  # type: ignore[import-untyped]
-from typing import Union, Dict
+
 from multidict import CIMultiDict, MultiDict, istr
 
 # Note that this benchmark should not be refactored to use pytest.mark.parametrize