diff --git a/neutron/tests/unit/openvswitch/test_ovs_tunnel.py b/neutron/tests/unit/openvswitch/test_ovs_tunnel.py
index 4600abf4635..32f37f092a1 100644
--- a/neutron/tests/unit/openvswitch/test_ovs_tunnel.py
+++ b/neutron/tests/unit/openvswitch/test_ovs_tunnel.py
@@ -520,8 +520,10 @@ class TunnelTest(base.BaseTestCase):
             mock.patch.object(ovs_neutron_agent.OVSNeutronAgent,
                               'scan_ports'),
             mock.patch.object(ovs_neutron_agent.OVSNeutronAgent,
-                              'process_network_ports')
-        ) as (log_exception, scan_ports, process_network_ports):
+                              'process_network_ports'),
+            mock.patch.object(ovs_neutron_agent.OVSNeutronAgent,
+                              'tunnel_sync')
+        ) as (log_exception, scan_ports, process_network_ports, ts):
             log_exception.side_effect = Exception(
                 'Fake exception to get out of the loop')
             scan_ports.side_effect = [reply2, reply3]