diff --git a/neutron/tests/unit/agent/linux/test_bridge_lib.py b/neutron/tests/unit/agent/linux/test_bridge_lib.py
index 357abeb1c77..1cbe3e643c6 100644
--- a/neutron/tests/unit/agent/linux/test_bridge_lib.py
+++ b/neutron/tests/unit/agent/linux/test_bridge_lib.py
@@ -29,6 +29,9 @@ class BridgeLibTest(base.BaseTestCase):
 
     def setUp(self):
         super(BridgeLibTest, self).setUp()
+        mock.patch(
+            'neutron.common.ipv6_utils.is_enabled_and_bind_by_default',
+            return_value=True).start()
         ip_wrapper = mock.patch('neutron.agent.linux.ip_lib.IPWrapper').start()
         self.execute = ip_wrapper.return_value.netns.execute