diff --git a/graphene_django/types.py b/graphene_django/types.py
index a1cc346..4997266 100644
--- a/graphene_django/types.py
+++ b/graphene_django/types.py
@@ -3,6 +3,7 @@ from collections import OrderedDict
 from functools import partial
 
 import six
+from django.db.models import Model
 from django.utils.functional import SimpleLazyObject
 
 import graphene