diff --git a/tests/integration/test_aiohttp.py b/tests/integration/test_aiohttp.py
index 5a646ef..c4c8523 100644
--- a/tests/integration/test_aiohttp.py
+++ b/tests/integration/test_aiohttp.py
@@ -324,19 +324,19 @@ def test_double_requests(tmpdir):
 
 def test_cookies(scheme, tmpdir):
     url = scheme + (
-        '://httpbin.org/response-headers?'
-        'set-cookie=' + urllib.parse.quote('cookie_1=val_1; Path=/') + '&'
-        'Set-Cookie=' + urllib.parse.quote('Cookie_2=Val_2; Path=/')
+        "://httpbin.org/response-headers?"
+        "set-cookie=" + urllib.parse.quote("cookie_1=val_1; Path=/") + "&"
+        "Set-Cookie=" + urllib.parse.quote("Cookie_2=Val_2; Path=/")
     )
     with vcr.use_cassette(str(tmpdir.join("cookies.yaml"))) as cassette:
-        response, _ = get(url, output='json')
+        response, _ = get(url, output="json")
 
-    assert response.cookies.get('cookie_1').value == 'val_1'
-    assert response.cookies.get('Cookie_2').value == 'Val_2'
+    assert response.cookies.get("cookie_1").value == "val_1"
+    assert response.cookies.get("Cookie_2").value == "Val_2"
 
     with vcr.use_cassette(str(tmpdir.join("cookies.yaml"))) as cassette:
-        response, _ = get(url, output='json')
+        response, _ = get(url, output="json")
         assert cassette.play_count == 1
 
-    assert response.cookies.get('cookie_1').value == 'val_1'
-    assert response.cookies.get('Cookie_2').value == 'Val_2'
+    assert response.cookies.get("cookie_1").value == "val_1"
+    assert response.cookies.get("Cookie_2").value == "Val_2"
diff --git a/vcr/stubs/aiohttp_stubs/__init__.py b/vcr/stubs/aiohttp_stubs/__init__.py
index dbc1228..155ec46 100644
--- a/vcr/stubs/aiohttp_stubs/__init__.py
+++ b/vcr/stubs/aiohttp_stubs/__init__.py
@@ -76,7 +76,7 @@ def build_response(vcr_request, vcr_response, history):
         try:
             response.cookies.load(hdr)
         except CookieError as exc:
-            log.warning('Can not load response cookies: %s', exc)
+            log.warning("Can not load response cookies: %s", exc)
 
     response.close()
     return response