diff --git a/graphene_django/fields.py b/graphene_django/fields.py
index e3129c6..ce264ea 100644
--- a/graphene_django/fields.py
+++ b/graphene_django/fields.py
@@ -1,4 +1,4 @@
-from functools import partial
+from functools import partial, reduce
 
 from django.db.models.query import QuerySet