diff --git a/neutron/plugins/ml2/plugin.py b/neutron/plugins/ml2/plugin.py
index 81bfb7117db..1c7a32ea32d 100644
--- a/neutron/plugins/ml2/plugin.py
+++ b/neutron/plugins/ml2/plugin.py
@@ -713,7 +713,7 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
                     }
                 )
             else:
-                mtu = type_driver.get_mtu(provider.PHYSICAL_NETWORK)
+                mtu = type_driver.get_mtu(s[provider.PHYSICAL_NETWORK])
                 # Some drivers, like 'local', may return None; the assumption
                 # then is that for the segment type, MTU has no meaning or
                 # unlimited, and so we should then ignore those values.
diff --git a/neutron/tests/unit/plugins/ml2/test_plugin.py b/neutron/tests/unit/plugins/ml2/test_plugin.py
index c4c60554a92..52166740365 100644
--- a/neutron/tests/unit/plugins/ml2/test_plugin.py
+++ b/neutron/tests/unit/plugins/ml2/test_plugin.py
@@ -1161,6 +1161,19 @@ class TestMl2PluginOnly(Ml2PluginV2TestCase):
 
 class Test_GetNetworkMtu(Ml2PluginV2TestCase):
 
+    def test_get_mtu_with_physical_net(self):
+        plugin = manager.NeutronManager.get_plugin()
+        mock_type_driver = mock.MagicMock()
+        plugin.type_manager.drivers['driver1'] = mock.Mock()
+        plugin.type_manager.drivers['driver1'].obj = mock_type_driver
+        net = {
+            'name': 'net1',
+            pnet.NETWORK_TYPE: 'driver1',
+            pnet.PHYSICAL_NETWORK: 'physnet1',
+        }
+        plugin._get_network_mtu(net)
+        mock_type_driver.get_mtu.assert_called_once_with('physnet1')
+
     def _register_type_driver_with_mtu(self, driver, mtu):
         plugin = manager.NeutronManager.get_plugin()