diff --git a/src/python/grpcio_tests/tests/unit/_interceptor_test.py b/src/python/grpcio_tests/tests/unit/_interceptor_test.py
index a5b2ad2b47c..fcc2e1c2b69 100644
--- a/src/python/grpcio_tests/tests/unit/_interceptor_test.py
+++ b/src/python/grpcio_tests/tests/unit/_interceptor_test.py
@@ -18,6 +18,7 @@ import itertools
 import threading
 import unittest
 import logging
+import os
 from concurrent import futures
 
 import grpc