diff --git a/graphene_django/rest_framework/mutation.py b/graphene_django/rest_framework/mutation.py
index f9b074d..8985dfe 100644
--- a/graphene_django/rest_framework/mutation.py
+++ b/graphene_django/rest_framework/mutation.py
@@ -1,6 +1,7 @@
 from collections import OrderedDict
 
 from django.shortcuts import get_object_or_404
+from rest_framework import serializers
 
 import graphene
 from graphene.relay.mutation import ClientIDMutation