diff --git a/vng_api_common/extensions/filters/query.py b/vng_api_common/extensions/filters/query.py
index 6143cdd6..e4a7d0fe 100644
--- a/vng_api_common/extensions/filters/query.py
+++ b/vng_api_common/extensions/filters/query.py
@@ -6,8 +6,8 @@
 from drf_spectacular.extensions import OpenApiFilterExtension
 from rest_framework.filters import OrderingFilter
 
-from vng_api_common.filters import URLModelChoiceFilter
 from vng_api_common.extensions.utils import get_target_field
+from vng_api_common.filters import URLModelChoiceFilter
 from vng_api_common.oas import TYPE_ARRAY, TYPE_STRING
 from vng_api_common.utils import underscore_to_camel
 
diff --git a/vng_api_common/polymorphism.py b/vng_api_common/polymorphism.py
index f0469d59..750902cd 100644
--- a/vng_api_common/polymorphism.py
+++ b/vng_api_common/polymorphism.py
@@ -38,6 +38,7 @@
 from typing import Any, Dict, Union
 
 from django.core.exceptions import FieldDoesNotExist
+
 from rest_framework import serializers
 
 __all__ = ["Discriminator", "PolymorphicSerializer"]