diff --git a/pre_commit/commands/install_uninstall.py b/pre_commit/commands/install_uninstall.py
index 1223a43f..152b1fb7 100644
--- a/pre_commit/commands/install_uninstall.py
+++ b/pre_commit/commands/install_uninstall.py
@@ -77,7 +77,7 @@ def _install_hook_script(
         # git repo we shouldn't try to mess with it
         repo_dir = os.path.dirname(os.path.realpath(git_dir))
         if os.path.commonpath(
-            [repo_dir, os.path.realpath(hook_path)]
+            [repo_dir, os.path.realpath(hook_path)],
         ) != repo_dir:
             logger.error(
                 'Cowardly refusing to install hook script to a directory '