diff --git a/tests/integration/service_test.py b/tests/integration/service_test.py
index 189eb9da..37dc4a0e 100644
--- a/tests/integration/service_test.py
+++ b/tests/integration/service_test.py
@@ -885,7 +885,6 @@ class ServiceTest(DockerClientTestCase):
             'FILE_DEF': 'F1',
             'FILE_DEF_EMPTY': '',
             'ENV_DEF': 'E3',
-            'NO_DEF': ''
         }.items():
             self.assertEqual(env[k], v)