diff --git a/py/pyscrut.pyi b/py/pyscrut.pyi
index 1d0c539..fd1a0d4 100644
--- a/py/pyscrut.pyi
+++ b/py/pyscrut.pyi
@@ -3,6 +3,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
+# pyre-unsafe
+
 from __future__ import annotations
 
 from enum import Enum