diff --git a/nailgun/entities.py b/nailgun/entities.py
index 843610c6..6c9815e9 100644
--- a/nailgun/entities.py
+++ b/nailgun/entities.py
@@ -3532,6 +3532,7 @@ def __init__(self, server_config=None, **kwargs):
             ),
             'realm': entity_fields.OneToOneField(Realm),
             'subnet': entity_fields.OneToOneField(Subnet),
+            'subnet6': entity_fields.OneToOneField(Subnet),
             'group_parameters_attributes': entity_fields.ListField(),
         }