diff --git a/src/python/grpcio_tests/tests/unit/_local_credentials_test.py b/src/python/grpcio_tests/tests/unit/_local_credentials_test.py
index 14b68cb5907..8690505b861 100644
--- a/src/python/grpcio_tests/tests/unit/_local_credentials_test.py
+++ b/src/python/grpcio_tests/tests/unit/_local_credentials_test.py
@@ -14,6 +14,7 @@
 """Test of RPCs made using local credentials."""
 
 import unittest
+import os
 from concurrent.futures import ThreadPoolExecutor
 import grpc