Index: uspace/lib/c/include/async.h
===================================================================
--- uspace/lib/c/include/async.h	(revision 01900b629bbf57a290cd30c16fdaa744836c4c32)
+++ uspace/lib/c/include/async.h	(revision 128359ebc085c950da1f7e34c3928f12654b438f)
@@ -282,5 +282,5 @@
 extern errno_t async_connect_to_me(async_exch_t *, iface_t, sysarg_t, sysarg_t);
 
-extern errno_t async_hangup(async_sess_t *);
+extern void async_hangup(async_sess_t *);
 
 extern async_exch_t *async_exchange_begin(async_sess_t *);