diff --git a/sys/sys/msg.h b/sys/sys/msg.h
--- a/sys/sys/msg.h
+++ b/sys/sys/msg.h
@@ -162,9 +162,6 @@
 int msgget(key_t, int);
 ssize_t msgrcv(int, void *, size_t, long, int);
 int msgsnd(int, const void *, size_t, int);
-#if __BSD_VISIBLE
-int msgsys(int, ...);
-#endif
 __END_DECLS
 #endif /* !_KERNEL */
 
diff --git a/sys/sys/sem.h b/sys/sys/sem.h
--- a/sys/sys/sem.h
+++ b/sys/sys/sem.h
@@ -148,9 +148,6 @@
 #else /* !_KERNEL */
 
 __BEGIN_DECLS
-#if __BSD_VISIBLE
-int semsys(int, ...);
-#endif
 int semctl(int, int, int, ...);
 int semget(key_t, int, int);
 int semop(int, struct sembuf *, size_t);
diff --git a/sys/sys/shm.h b/sys/sys/shm.h
--- a/sys/sys/shm.h
+++ b/sys/sys/shm.h
@@ -171,9 +171,6 @@
 #endif
 
 __BEGIN_DECLS
-#if __BSD_VISIBLE
-int shmsys(int, ...);
-#endif
 void *shmat(int, const void *, int);
 int shmget(key_t, size_t, int);
 int shmctl(int, int, struct shmid_ds *);