diff --git a/troveclient/osc/v1/database_instances.py b/troveclient/osc/v1/database_instances.py
index c99b7766..fb751f63 100644
--- a/troveclient/osc/v1/database_instances.py
+++ b/troveclient/osc/v1/database_instances.py
@@ -509,21 +509,24 @@ class ResizeDatabaseInstanceFlavor(command.Command):
             help=_('ID or name of the instance')
         )
         parser.add_argument(
-            'flavor_id',
-            metavar='<flavor_id>',
+            'flavor',
             type=str,
-            help=_('New flavor ID of the instance')
+            help=_('ID or name of the new flavor.')
         )
         return parser
 
     def take_action(self, parsed_args):
         instance_mgr = self.app.client_manager.database.instances
+        flavor_mgr = self.app.client_manager.database.flavors
+
         instance_id = parsed_args.instance
-
         if not uuidutils.is_uuid_like(instance_id):
-            instance_id = osc_utils.find_resource(instance_mgr, instance_id)
+            instance = osc_utils.find_resource(instance_mgr, instance_id)
+            instance_id = instance.id
 
-        instance_mgr.resize_instance(instance_id, parsed_args.flavor_id)
+        flavor = osc_utils.find_resource(flavor_mgr, parsed_args.flavor)
+
+        instance_mgr.resize_instance(instance_id, flavor.id)
 
 
 class UpgradeDatabaseInstance(command.Command):
diff --git a/troveclient/tests/osc/v1/test_database_instances.py b/troveclient/tests/osc/v1/test_database_instances.py
index af2134ed..72202fe6 100644
--- a/troveclient/tests/osc/v1/test_database_instances.py
+++ b/troveclient/tests/osc/v1/test_database_instances.py
@@ -404,14 +404,15 @@ class TestDatabaseInstanceResizeFlavor(TestInstances):
     @mock.patch.object(utils, 'find_resource')
     def test_instance_resize_flavor(self, mock_find):
         args = ['instance1', 'flavor_id']
-        mock_find.return_value = 'fake_instance_id'
-
+        mock_find.side_effect = [
+            mock.MagicMock(id='fake_instance_id'),
+            mock.MagicMock(id='fake_flavor_id')
+        ]
         parsed_args = self.check_parser(self.cmd, args, [])
-        result = self.cmd.take_action(parsed_args)
+        self.cmd.take_action(parsed_args)
 
         self.instance_client.resize_instance.assert_called_with(
-            'fake_instance_id', 'flavor_id')
-        self.assertIsNone(result)
+            'fake_instance_id', 'fake_flavor_id')
 
 
 class TestDatabaseInstanceUpgrade(TestInstances):