Index: uspace/lib/c/include/io/window.h
===================================================================
--- uspace/lib/c/include/io/window.h	(revision 290a0f0bca64b949d48d6b8a5d58988fc13ad577)
+++ uspace/lib/c/include/io/window.h	(revision 69c1995350adfe31ce9f6f2a6810575aa43f26bf)
@@ -102,5 +102,5 @@
 } window_grab_flags_t;
 
-extern int win_register(async_sess_t *, service_id_t *, service_id_t *);
+extern int win_register(async_sess_t *, service_id_t *, service_id_t *, sysarg_t, sysarg_t);
 
 extern int win_get_event(async_sess_t *, window_event_t *);