diff -up unique-1.0.4/unique/uniquemessage.c.startup_id unique-1.0.4/unique/uniquemessage.c
--- unique-1.0.4/unique/uniquemessage.c.startup_id	2008-12-20 14:28:52.000000000 -0500
+++ unique-1.0.4/unique/uniquemessage.c	2008-12-20 14:29:19.000000000 -0500
@@ -105,6 +105,7 @@ unique_message_data_copy (UniqueMessageD
     }
 
   retval->screen = message_data->screen;
+  retval->startup_id = g_strdup (message_data->startup_id);
 
   return retval;
 }