diff --git a/neutron/tests/unit/agent/l3/test_dvr_local_router.py b/neutron/tests/unit/agent/l3/test_dvr_local_router.py
index 982597beffd..754bce42929 100644
--- a/neutron/tests/unit/agent/l3/test_dvr_local_router.py
+++ b/neutron/tests/unit/agent/l3/test_dvr_local_router.py
@@ -307,6 +307,7 @@ def test_floating_forward_rules_no_fip_ns(self):
         self.assertFalse(ri.floating_forward_rules(fip))
 
     def test_floating_forward_rules(self):
+        self.utils_exec.return_value = "iptables v1.6.2 (legacy)"
         router = mock.MagicMock()
         router.get.return_value = [{'host': HOSTNAME},
                                    {'host': mock.sentinel.otherhost}]