diff --git a/server/autotest_server/testers/haskell/setup.py b/server/autotest_server/testers/haskell/setup.py
index 5f049b62..43f8090c 100644
--- a/server/autotest_server/testers/haskell/setup.py
+++ b/server/autotest_server/testers/haskell/setup.py
@@ -19,7 +19,10 @@ def install():
     resolver = "lts-16.17"
     cmd = ["stack", "build", "--resolver", resolver, "--system-ghc", *HASKELL_TEST_DEPS]
     subprocess.run(cmd, check=True)
-    subprocess.run(os.path.join(os.path.dirname(os.path.realpath(__file__)), "stack_permissions.sh"), check=True, shell=True)
+    subprocess.run(
+        os.path.join(os.path.dirname(os.path.realpath(__file__)), "stack_permissions.sh"), check=True, shell=True
+    )
+
 
 def settings():
     with open(os.path.join(os.path.dirname(os.path.realpath(__file__)), "settings_schema.json")) as f:
diff --git a/server/autotest_server/tests/test_autotest_server.py b/server/autotest_server/tests/test_autotest_server.py
index 6629ffe0..e53a69b9 100644
--- a/server/autotest_server/tests/test_autotest_server.py
+++ b/server/autotest_server/tests/test_autotest_server.py
@@ -49,8 +49,9 @@ def test_sticky():
 
     assert os.path.exists(path) is False
 
+
 def test_stack_permissions():
-    stack_root = os.environ['STACK_ROOT']
+    stack_root = os.environ["STACK_ROOT"]
     path = f"{stack_root}/stack.sqlite3.pantry-write-lock"
     permissions = oct(os.stat(path).st_mode)[-3:]
-    assert permissions[1] == '6'
\ No newline at end of file
+    assert permissions[1] == "6"