diff --git a/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py b/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py
index 2a829bd470b..33a404359d5 100644
--- a/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py
+++ b/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py
@@ -1216,7 +1216,9 @@ class OVSNeutronAgent(sg_rpc.SecurityGroupAgentRpcCallbackMixin,
 
     def _get_port_info(self, registered_ports, cur_ports,
                        readd_registered_ports):
-        port_info = {'current': cur_ports}
+        port_info = {'current': cur_ports,
+                     'added': set(),
+                     'removed': set()}
         # FIXME(salv-orlando): It's not really necessary to return early
         # if nothing has changed.
         if not readd_registered_ports and cur_ports == registered_ports:
diff --git a/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py b/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py
index c2802bef402..e6f49edaa97 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py
@@ -367,7 +367,9 @@ class TestOvsNeutronAgent(object):
     def test_scan_ports_returns_current_only_for_unchanged_ports(self):
         vif_port_set = set([1, 3])
         registered_ports = set([1, 3])
-        expected = {'current': vif_port_set}
+        expected = {'current': vif_port_set,
+                    'added': set(),
+                    'removed': set()}
         actual = self.mock_scan_ports(vif_port_set, registered_ports)
         self.assertEqual(expected, actual)
 
@@ -418,7 +420,8 @@ class TestOvsNeutronAgent(object):
         vif_port_set = set([1, 2, 3])
         registered_ports = set([1, 2, 3])
         updated_ports = set([2])
-        expected = dict(current=vif_port_set, updated=set([2]))
+        expected = dict(current=vif_port_set, updated=set([2]),
+                        added=set(), removed=set())
         actual = self.mock_scan_ports(vif_port_set, registered_ports,
                                       updated_ports)
         self.assertEqual(expected, actual)
@@ -2239,7 +2242,9 @@ class AncillaryBridgesTest(object):
     def test_scan_ancillary_ports_returns_cur_only_for_unchanged_ports(self):
         vif_port_set = set([1, 2])
         registered_ports = set([1, 2])
-        expected = dict(current=vif_port_set)
+        expected = dict(current=vif_port_set,
+                        added=set(),
+                        removed=set())
         actual = self.mock_scan_ancillary_ports(vif_port_set, registered_ports)
         self.assertEqual(expected, actual)