diff --git a/pre_commit/commands/hook_impl.py b/pre_commit/commands/hook_impl.py
index d33fbce2..d9849a1c 100644
--- a/pre_commit/commands/hook_impl.py
+++ b/pre_commit/commands/hook_impl.py
@@ -111,7 +111,10 @@ def _ns(
 
 
 def _rev_exists(rev: str) -> bool:
-    return subprocess.call(('git', 'cat-file', '-e', rev), stderr=subprocess.DEVNULL) == 0
+    return subprocess.call(
+        ('git', 'cat-file', '-e', rev),
+        stderr=subprocess.DEVNULL,
+    ) == 0
 
 
 def _pre_push_ns(