diff --git a/pre_commit/languages/docker.py b/pre_commit/languages/docker.py
index cc1e4afab..b5dfe308e 100644
--- a/pre_commit/languages/docker.py
+++ b/pre_commit/languages/docker.py
@@ -9,7 +9,8 @@
 from pre_commit.hook import Hook
 from pre_commit.languages import helpers
 from pre_commit.prefix import Prefix
-from pre_commit.util import clean_path_on_failure, cmd_output_b
+from pre_commit.util import clean_path_on_failure
+from pre_commit.util import cmd_output_b
 
 ENVIRONMENT_DIR = 'docker'
 PRE_COMMIT_LABEL = 'PRE_COMMIT'
@@ -31,7 +32,7 @@ def _get_docker_path(path: str) -> str:
     hostname = socket.gethostname()
 
     _, out, _ = cmd_output_b(
-        ' '.join(['docker', 'inspect', hostname])
+        ' '.join(['docker', 'inspect', hostname]),
     )
 
     docker_output = json.loads(out)
diff --git a/tests/languages/docker_test.py b/tests/languages/docker_test.py
index 1ce005fc8..4e86b33f9 100644
--- a/tests/languages/docker_test.py
+++ b/tests/languages/docker_test.py
@@ -26,9 +26,11 @@ class TestInDocker:
     @pytest.fixture
     def mock_file_fixture(self):
         return lambda read_data: \
-            mock.patch.object(builtins, 'open',
-                              new_callable=mock_open,
-                              read_data=read_data)
+            mock.patch.object(
+                builtins, 'open',
+                new_callable=mock_open,
+                read_data=read_data,
+            )
 
     def test_in_docker_no_file(self, mock_file_fixture):
         with mock_file_fixture(None) as m: