diff --git a/tests/test_tests_util.py b/tests/test_tests_util.py
index 286caf04cdd..999ca93541b 100644
--- a/tests/test_tests_util.py
+++ b/tests/test_tests_util.py
@@ -1,3 +1,4 @@
+import os
 from pathlib import Path
 import shutil