diff --git a/neutron/agent/l3/ha_router.py b/neutron/agent/l3/ha_router.py
index aaa2b1ef63e..c165f000a07 100644
--- a/neutron/agent/l3/ha_router.py
+++ b/neutron/agent/l3/ha_router.py
@@ -30,6 +30,7 @@ from neutron.agent.linux import ip_lib
 from neutron.agent.linux import keepalived
 from neutron.common import constants as const
 from neutron.common import utils as common_utils
+from neutron.ipam import utils as ipam_utils
 
 LOG = logging.getLogger(__name__)
 HA_DEV_PREFIX = 'ha-'
@@ -270,6 +271,14 @@ class HaRouter(router.RouterInfo):
 
         default_gw_rts = []
         instance = self._get_keepalived_instance()
+        for subnet in ex_gw_port.get('subnets', []):
+            is_gateway_not_in_subnet = (subnet['gateway_ip'] and
+                                        not ipam_utils.check_subnet_ip(
+                                            subnet['cidr'],
+                                            subnet['gateway_ip']))
+            if is_gateway_not_in_subnet:
+                default_gw_rts.append(keepalived.KeepalivedVirtualRoute(
+                    subnet['gateway_ip'], None, interface_name, scope='link'))
         for gw_ip in gateway_ips:
             # TODO(Carl) This is repeated everywhere.  A method would
             # be nice.
diff --git a/neutron/tests/unit/agent/l3/test_ha_router.py b/neutron/tests/unit/agent/l3/test_ha_router.py
index a44745267b4..4224b91c27e 100644
--- a/neutron/tests/unit/agent/l3/test_ha_router.py
+++ b/neutron/tests/unit/agent/l3/test_ha_router.py
@@ -77,6 +77,10 @@ class TestBasicRouterOperations(base.BaseTestCase):
         ri._add_default_gw_virtual_route(ex_gw_port, 'qg-abc')
         self.assertEqual(0, len(mock_instance.virtual_routes.gateway_routes))
 
+        subnets[1]['gateway_ip'] = '30.0.1.1'
+        ri._add_default_gw_virtual_route(ex_gw_port, 'qg-abc')
+        self.assertEqual(2, len(mock_instance.virtual_routes.gateway_routes))
+
     @mock.patch.object(router_info.RouterInfo, 'remove_floating_ip')
     def test_remove_floating_ip(self, super_remove_floating_ip):
         ri = self._create_router(mock.MagicMock())