diff --git a/src/black/concurrency.py b/src/black/concurrency.py
index 7dd0d8b96cf..88a67264482 100644
--- a/src/black/concurrency.py
+++ b/src/black/concurrency.py
@@ -9,10 +9,10 @@
 import os
 import signal
 import sys
+import traceback
 from concurrent.futures import Executor, ProcessPoolExecutor, ThreadPoolExecutor
 from multiprocessing import Manager
 from pathlib import Path
-import traceback
 from typing import Any, Iterable, Optional, Set
 
 from mypy_extensions import mypyc_attr