diff -up gtk+-2.15.1/gtk/gtkradioaction.c.radio-proxy gtk+-2.15.1/gtk/gtkradioaction.c
--- gtk+-2.15.1/gtk/gtkradioaction.c.radio-proxy	2009-01-25 19:00:44.000000000 -0500
+++ gtk+-2.15.1/gtk/gtkradioaction.c	2009-01-25 19:01:09.000000000 -0500
@@ -176,6 +176,8 @@ gtk_radio_action_init (GtkRadioAction *a
   action->private_data = GTK_RADIO_ACTION_GET_PRIVATE (action);
   action->private_data->group = g_slist_prepend (NULL, action);
   action->private_data->value = 0;
+
+  gtk_toggle_action_set_draw_as_radio (GTK_TOGGLE_ACTION (action), TRUE);
 }
 
 /**