diff --git a/pre_commit/staged_files_only.py b/pre_commit/staged_files_only.py
index 88123565..456a51f4 100644
--- a/pre_commit/staged_files_only.py
+++ b/pre_commit/staged_files_only.py
@@ -49,6 +49,8 @@ def _intent_to_add_cleared() -> Generator[None, None, None]:
 
 @contextlib.contextmanager
 def _unstaged_changes_cleared(patch_dir: str) -> Generator[None, None, None]:
+    # Work around a bug in fsmonitor daemon by stopping it.
+    cmd_output('git', 'fsmonitor--daemon', 'stop')
     tree = cmd_output('git', 'write-tree')[1].strip()
     diff_cmd = (
         'git', 'diff-index', '--ignore-submodules', '--binary',