diff --git a/example/example/settings.py b/example/example/settings.py
index 1514227f..58e4f357 100644
--- a/example/example/settings.py
+++ b/example/example/settings.py
@@ -41,7 +41,7 @@
     'django.contrib.staticfiles.finders.AppDirectoriesFinder',
 )
 
-MIDDLEWARE_CLASSES = (
+MIDDLEWARE = (
     'django.middleware.common.CommonMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
diff --git a/runtests.py b/runtests.py
index bb3074d3..913212e0 100755
--- a/runtests.py
+++ b/runtests.py
@@ -38,7 +38,7 @@
             'polymorphic',
             'polymorphic.tests',
         ),
-        MIDDLEWARE_CLASSES=(),
+        MIDDLEWARE=(),
         SITE_ID=3,
         TEMPLATES=[{
                 "BACKEND": "django.template.backends.django.DjangoTemplates",