Index: kernel/generic/include/ipc/ipc.h
===================================================================
--- kernel/generic/include/ipc/ipc.h	(revision 96c30c81327e058d9ccd42a8628f09c4f75b398a)
+++ kernel/generic/include/ipc/ipc.h	(revision 1b6477e9b3e1882753cf68254b8c679a3e1ce05b)
@@ -193,5 +193,5 @@
 extern errno_t ipc_call_sync(phone_t *, call_t *);
 extern errno_t ipc_call(phone_t *, call_t *);
-extern call_t *ipc_wait_for_call(answerbox_t *, uint32_t, unsigned int);
+extern errno_t ipc_wait_for_call(answerbox_t *, uint32_t, unsigned int, call_t **);
 extern errno_t ipc_forward(call_t *, phone_t *, answerbox_t *, unsigned int);
 extern void ipc_answer(answerbox_t *, call_t *);