[idp] Backend not recognized by registration app when upgrading to django1.2.5

authentic2/urls.py

@@ -17,7 +17,8 @@ urlpatterns = patterns('',
     (r'^redirect/(.*)', 'authentic2.views.redirect'),
     url(r'^accounts/register',
        'registration.views.register',
-       { 'form_class': AuthenticRegistrationForm },
+       {'backend':'registration.backends.default.DefaultBackend',
+        'form_class': AuthenticRegistrationForm },
        name='registration_register',
        ),
     (r'^accounts/', include('registration.urls')),