diff --git a/neutron/db/db_base_plugin_common.py b/neutron/db/db_base_plugin_common.py
index 444171b4ec4..9eb0a9d2d35 100644
--- a/neutron/db/db_base_plugin_common.py
+++ b/neutron/db/db_base_plugin_common.py
@@ -252,15 +252,6 @@ class DbBasePluginCommon(object):
             raise exceptions.NetworkNotFound(net_id=id)
         return network
 
-    def _get_subnet(self, context, id):
-        # TODO(slaweq): remove this method when all will be switched to use OVO
-        # objects only
-        try:
-            subnet = model_query.get_by_id(context, models_v2.Subnet, id)
-        except exc.NoResultFound:
-            raise exceptions.SubnetNotFound(subnet_id=id)
-        return subnet
-
     def _get_subnet_object(self, context, id):
         subnet = subnet_obj.Subnet.get_object(context, id=id)
         if not subnet:
diff --git a/neutron/tests/unit/db/test_db_base_plugin_v2.py b/neutron/tests/unit/db/test_db_base_plugin_v2.py
index f6964638760..a2e13b3c818 100644
--- a/neutron/tests/unit/db/test_db_base_plugin_v2.py
+++ b/neutron/tests/unit/db/test_db_base_plugin_v2.py
@@ -4525,9 +4525,6 @@ class TestSubnetsV2(NeutronDbPluginV2TestCase):
                              'cidr': 'fe80::/64',
                              'gateway_ip': 'fe80::1',
                              'tenant_id': v4_subnet['subnet']['tenant_id']}
-                mock.patch.object(db_base_plugin_common.DbBasePluginCommon,
-                                  '_get_subnet',
-                                  return_value=v6_subnet).start()
             # Add an IPv6 auto-address subnet to the network
             with mock.patch.object(directory.get_plugin(),
                                    'update_port') as mock_updated_port: