diff --git a/django/conf/global_settings.py b/django/conf/global_settings.py
index 54fdcf0770..8602cab229 100644
--- a/django/conf/global_settings.py
+++ b/django/conf/global_settings.py
@@ -106,6 +106,7 @@ SECRET_KEY = ''
 # this middleware classes will be applied in the order given, and in the
 # response phase the middleware will be applied in reverse order.
 MIDDLEWARE_CLASSES = (
+    "django.middleware.sessions.SessionMiddleware",
     "django.middleware.common.CommonMiddleware",
     "django.middleware.doc.XViewMiddleware",
 )