diff --git a/nixos/lib/test-driver/src/test_driver/driver.py b/nixos/lib/test-driver/src/test_driver/driver.py
index 50b6fdb2170d..0bbf80f76a12 100644
--- a/nixos/lib/test-driver/src/test_driver/driver.py
+++ b/nixos/lib/test-driver/src/test_driver/driver.py
@@ -27,8 +27,6 @@ from test_driver.machine import (
 from test_driver.polling_condition import PollingCondition
 from test_driver.vlan import VLan
 
-SENTINEL = object()
-
 
 class AssertionTester(TestCase):
     """