diff --git a/test_runner/regress/test_local_file_cache.py b/test_runner/regress/test_local_file_cache.py
index e328db6eef..f2a37b57ee 100644
--- a/test_runner/regress/test_local_file_cache.py
+++ b/test_runner/regress/test_local_file_cache.py
@@ -1,3 +1,4 @@
+import os
 import random
 import threading
 import time