diff --git a/django/contrib/sitemaps/__init__.py b/django/contrib/sitemaps/__init__.py
index 2d0e047233..f877317f16 100644
--- a/django/contrib/sitemaps/__init__.py
+++ b/django/contrib/sitemaps/__init__.py
@@ -33,7 +33,7 @@ def ping_google(sitemap_url=None, ping_url=PING_URL):
     params = urllib.urlencode({'sitemap':url})
     urllib.urlopen("%s?%s" % (ping_url, params))
 
-class Sitemap:
+class Sitemap(object):
     # This limit is defined by Google. See the index documentation at
     # http://sitemaps.org/protocol.php#index.
     limit = 50000