diff --git a/nova/objects/aggregate.py b/nova/objects/aggregate.py
index 3c2a03dda..681470d9c 100644
--- a/nova/objects/aggregate.py
+++ b/nova/objects/aggregate.py
@@ -162,11 +162,10 @@ class AggregateList(base.ObjectListBase, base.NovaObject):
     fields = {
         'objects': fields.ListOfObjectsField('Aggregate'),
         }
-    child_versions = {
-        '1.0': '1.1',
-        '1.1': '1.1',
-        # NOTE(danms): Aggregate was at 1.1 before we added this
-        '1.2': '1.1',
+
+    # NOTE(danms): Aggregate was at 1.1 before we added this
+    obj_relationships = {
+        'objects': [('1.0', '1.1'), ('1.1', '1.1'), ('1.2', '1.1')],
         }
 
     @classmethod