diff --git a/rest_framework/authtoken/serializers.py b/rest_framework/authtoken/serializers.py
index d3c9b8def..31e111b56 100644
--- a/rest_framework/authtoken/serializers.py
+++ b/rest_framework/authtoken/serializers.py
@@ -1,9 +1,8 @@
-from django.contrib.auth import authenticate
+from django.contrib.auth import authenticate, get_user_model
 from django.utils.translation import ugettext_lazy as _
 
 from rest_framework import serializers
 from rest_framework.fields import empty
-from django.contrib.auth import get_user_model
 
 
 class AuthTokenSerializer(serializers.Serializer):