diff --git a/django/contrib/sessions/models.py b/django/contrib/sessions/models.py
index c086396947..8fc5e17d69 100644
--- a/django/contrib/sessions/models.py
+++ b/django/contrib/sessions/models.py
@@ -1,5 +1,12 @@
-import base64, md5, random, sys, datetime
+import os
+import sys
+import time
+import datetime
+import base64
+import md5
+import random
 import cPickle as pickle
+
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 from django.conf import settings