diff --git a/testing/typing_checks.py b/testing/typing_checks.py
index 19b9741e7..8f91a9fdf 100644
--- a/testing/typing_checks.py
+++ b/testing/typing_checks.py
@@ -4,7 +4,6 @@ This file is not executed, it is only checked by mypy to ensure that
 none of the code triggers any mypy errors.
 """
 import contextlib
-import sys
 from typing import Optional
 
 from typing_extensions import assert_type