diff --git a/lib/nose/serialize.rb b/lib/nose/serialize.rb
index 7ab5d751..4c872673 100644
--- a/lib/nose/serialize.rb
+++ b/lib/nose/serialize.rb
@@ -114,7 +114,7 @@ def call(_, represented:, fragment:, **)
 
         Index.new f.call(fragment['hash_fields']),
                   f.call(fragment['order_fields']),
-                  f.call(fragment['extra']), graph, fragment['key']
+                  f.call(fragment['extra']), graph, saved_key: fragment['key']
       end
     end