diff --git a/django/contrib/admin/actions.py b/django/contrib/admin/actions.py
index d35319435d..86edb0adfd 100644
--- a/django/contrib/admin/actions.py
+++ b/django/contrib/admin/actions.py
@@ -12,6 +12,10 @@ from django.utils.html import escape
 from django.utils.safestring import mark_safe
 from django.utils.text import capfirst
 from django.utils.translation import ugettext_lazy, ugettext as _
+try:
+    set
+except NameError:
+    from sets import Set as set     # Python 2.3 fallback
 
 def delete_selected(modeladmin, request, queryset):
     """