diff --git a/permission_backend_nonrel/admin.py b/permission_backend_nonrel/admin.py
index d61d02b..c82f1f3 100644
--- a/permission_backend_nonrel/admin.py
+++ b/permission_backend_nonrel/admin.py
@@ -3,9 +3,12 @@
 from django.utils.translation import ugettext
 from django.contrib.auth.admin import UserAdmin
 from django.contrib.admin.sites import NotRegistered
-from django.contrib.auth.models import User, Group, Permission
+from django.contrib.auth.models import Group, Permission
 from django.contrib.admin.widgets import FilteredSelectMultiple
 
+from django.contrib.auth import get_user_model
+User = get_user_model()
+
 from .models import UserPermissionList, GroupPermissionList
 from .utils import update_permissions_user, \
      update_user_groups, update_permissions_group
diff --git a/permission_backend_nonrel/models.py b/permission_backend_nonrel/models.py
index 0b5d952..15f3370 100644
--- a/permission_backend_nonrel/models.py
+++ b/permission_backend_nonrel/models.py
@@ -1,8 +1,11 @@
-from django.contrib.auth.models import User, Group
+from django.contrib.auth.models import Group
 from django.db import models
 
 from djangotoolbox.fields import ListField
 
+from django.contrib.auth import get_user_model
+User = get_user_model()
+
 
 class UserPermissionList(models.Model):
     user = models.ForeignKey(User)
diff --git a/permission_backend_nonrel/tests.py b/permission_backend_nonrel/tests.py
index 30e55c9..7c0e4b6 100644
--- a/permission_backend_nonrel/tests.py
+++ b/permission_backend_nonrel/tests.py
@@ -1,9 +1,12 @@
 from django.conf import settings
 from django.contrib.auth import authenticate
-from django.contrib.auth.models import User, Group, Permission, AnonymousUser
+from django.contrib.auth.models import Group, Permission, AnonymousUser
 from django.contrib.contenttypes.models import ContentType
 from django.test import TestCase
 
+from django.contrib.auth import get_user_model
+User = get_user_model()
+
 from .models import UserPermissionList, \
      GroupPermissionList
 from .utils import add_permission_to_user, \