diff --git a/neutron/objects/base.py b/neutron/objects/base.py
index 108089d9f89..455982387e7 100644
--- a/neutron/objects/base.py
+++ b/neutron/objects/base.py
@@ -691,6 +691,7 @@ class NeutronDbObject(NeutronObject):
 
     def _get_changed_synthetic_fields(self):
         fields = self.obj_get_changes()
+        fields = get_updatable_fields(self, fields)
         for field in self._get_changed_persistent_fields():
             if field in fields:
                 del fields[field]