diff --git a/neutron/db/db_base_plugin_v2.py b/neutron/db/db_base_plugin_v2.py
index 7fd2e37d978..ca430b2cd57 100644
--- a/neutron/db/db_base_plugin_v2.py
+++ b/neutron/db/db_base_plugin_v2.py
@@ -409,7 +409,7 @@ class NeutronDbPluginV2(db_base_plugin_common.DbBasePluginCommon,
             args = {'tenant_id': project_id,
                     'id': n.get('id') or uuidutils.generate_uuid(),
                     'name': n['name'],
-                    'mtu': n.get('mtu', constants.DEFAULT_NETWORK_MTU),
+                    'mtu': n.get('mtu', 0),
                     'admin_state_up': n['admin_state_up'],
                     'status': n.get('status', constants.NET_STATUS_ACTIVE),
                     'description': n.get('description')}