diff --git a/sys/kern/init_sysent.c b/sys/kern/init_sysent.c
index cb2e37ba7708..70b7de13cc84 100644
--- a/sys/kern/init_sysent.c
+++ b/sys/kern/init_sysent.c
@@ -495,9 +495,9 @@ struct sysent sysent[] = {
 	{ AS(abort2_args), (sy_call_t *)abort2, AUE_NULL, NULL, 0, 0 },	/* 463 = abort2 */
 	{ AS(thr_set_name_args), (sy_call_t *)thr_set_name, AUE_NULL, NULL, 0, 0 },	/* 464 = thr_set_name */
 	{ AS(aio_fsync_args), (sy_call_t *)lkmressys, AUE_NULL, NULL, 0, 0 },	/* 465 = aio_fsync */
-	{ AS(thr_setscheduler_args), (sy_call_t *)thr_setscheduler, AUE_NULL, NULL, 0, 0 },	/* 466 = thr_setscheduler */
-	{ AS(thr_getscheduler_args), (sy_call_t *)thr_getscheduler, AUE_NULL, NULL, 0, 0 },	/* 467 = thr_getscheduler */
-	{ AS(thr_setschedparam_args), (sy_call_t *)thr_setschedparam, AUE_NULL, NULL, 0, 0 },	/* 468 = thr_setschedparam */
+	{ AS(rtprio_thread_args), (sy_call_t *)rtprio_thread, AUE_RTPRIO, NULL, 0, 0 },	/* 466 = rtprio_thread */
+	{ 0, (sy_call_t *)nosys, AUE_NULL, NULL, 0, 0 },			/* 467 = nosys */
+	{ 0, (sy_call_t *)nosys, AUE_NULL, NULL, 0, 0 },			/* 468 = nosys */
 	{ 0, (sy_call_t *)nosys, AUE_NULL, NULL, 0, 0 },			/* 469 = __getpath_fromfd */
 	{ 0, (sy_call_t *)nosys, AUE_NULL, NULL, 0, 0 },			/* 470 = __getpath_fromaddr */
 };
diff --git a/sys/kern/syscalls.c b/sys/kern/syscalls.c
index bcb5f7d018cd..c5e0c1b4f066 100644
--- a/sys/kern/syscalls.c
+++ b/sys/kern/syscalls.c
@@ -473,9 +473,9 @@ const char *syscallnames[] = {
 	"abort2",			/* 463 = abort2 */
 	"thr_set_name",			/* 464 = thr_set_name */
 	"aio_fsync",			/* 465 = aio_fsync */
-	"thr_setscheduler",			/* 466 = thr_setscheduler */
-	"thr_getscheduler",			/* 467 = thr_getscheduler */
-	"thr_setschedparam",			/* 468 = thr_setschedparam */
+	"rtprio_thread",			/* 466 = rtprio_thread */
+	"#467",			/* 467 = nosys */
+	"#468",			/* 468 = nosys */
 	"#469",			/* 469 = __getpath_fromfd */
 	"#470",			/* 470 = __getpath_fromaddr */
 };
diff --git a/sys/kern/systrace_args.c b/sys/kern/systrace_args.c
index 1b40edf41665..8ccd0971d483 100644
--- a/sys/kern/systrace_args.c
+++ b/sys/kern/systrace_args.c
@@ -2749,32 +2749,12 @@ systrace_args(int sysnum, void *params, u_int64_t *uarg, int *n_args)
 		*n_args = 2;
 		break;
 	}
-	/* thr_setscheduler */
+	/* rtprio_thread */
 	case 466: {
-		struct thr_setscheduler_args *p = params;
-		iarg[0] = p->id; /* long */
-		iarg[1] = p->policy; /* int */
-		uarg[2] = (intptr_t) p->param; /* const struct sched_param * */
-		iarg[3] = p->param_size; /* int */
-		*n_args = 4;
-		break;
-	}
-	/* thr_getscheduler */
-	case 467: {
-		struct thr_getscheduler_args *p = params;
-		iarg[0] = p->id; /* long */
-		uarg[1] = (intptr_t) p->policy; /* int * */
-		uarg[2] = (intptr_t) p->param; /* struct sched_param * */
-		iarg[3] = p->param_size; /* int */
-		*n_args = 4;
-		break;
-	}
-	/* thr_setschedparam */
-	case 468: {
-		struct thr_setschedparam_args *p = params;
-		iarg[0] = p->id; /* long */
-		uarg[1] = (intptr_t) p->param; /* const struct sched_param * */
-		iarg[2] = p->param_size; /* int */
+		struct rtprio_thread_args *p = params;
+		iarg[0] = p->function; /* int */
+		iarg[1] = p->lwpid; /* lwpid_t */
+		uarg[2] = (intptr_t) p->rtp; /* struct rtprio * */
 		*n_args = 3;
 		break;
 	}
diff --git a/sys/sys/syscall.h b/sys/sys/syscall.h
index 537ee98be8e4..769ba040b895 100644
--- a/sys/sys/syscall.h
+++ b/sys/sys/syscall.h
@@ -389,7 +389,5 @@
 #define	SYS_abort2	463
 #define	SYS_thr_set_name	464
 #define	SYS_aio_fsync	465
-#define	SYS_thr_setscheduler	466
-#define	SYS_thr_getscheduler	467
-#define	SYS_thr_setschedparam	468
+#define	SYS_rtprio_thread	466
 #define	SYS_MAXSYSCALL	471
diff --git a/sys/sys/syscall.mk b/sys/sys/syscall.mk
index a09df716137a..1c83e4c26382 100644
--- a/sys/sys/syscall.mk
+++ b/sys/sys/syscall.mk
@@ -331,6 +331,4 @@ MIASM =  \
 	abort2.o \
 	thr_set_name.o \
 	aio_fsync.o \
-	thr_setscheduler.o \
-	thr_getscheduler.o \
-	thr_setschedparam.o
+	rtprio_thread.o
diff --git a/sys/sys/sysproto.h b/sys/sys/sysproto.h
index b5cee56083b4..7fae35aab906 100644
--- a/sys/sys/sysproto.h
+++ b/sys/sys/sysproto.h
@@ -1446,22 +1446,10 @@ struct aio_fsync_args {
 	char op_l_[PADL_(int)]; int op; char op_r_[PADR_(int)];
 	char aiocbp_l_[PADL_(struct aiocb *)]; struct aiocb * aiocbp; char aiocbp_r_[PADR_(struct aiocb *)];
 };
-struct thr_setscheduler_args {
-	char id_l_[PADL_(long)]; long id; char id_r_[PADR_(long)];
-	char policy_l_[PADL_(int)]; int policy; char policy_r_[PADR_(int)];
-	char param_l_[PADL_(const struct sched_param *)]; const struct sched_param * param; char param_r_[PADR_(const struct sched_param *)];
-	char param_size_l_[PADL_(int)]; int param_size; char param_size_r_[PADR_(int)];
-};
-struct thr_getscheduler_args {
-	char id_l_[PADL_(long)]; long id; char id_r_[PADR_(long)];
-	char policy_l_[PADL_(int *)]; int * policy; char policy_r_[PADR_(int *)];
-	char param_l_[PADL_(struct sched_param *)]; struct sched_param * param; char param_r_[PADR_(struct sched_param *)];
-	char param_size_l_[PADL_(int)]; int param_size; char param_size_r_[PADR_(int)];
-};
-struct thr_setschedparam_args {
-	char id_l_[PADL_(long)]; long id; char id_r_[PADR_(long)];
-	char param_l_[PADL_(const struct sched_param *)]; const struct sched_param * param; char param_r_[PADR_(const struct sched_param *)];
-	char param_size_l_[PADL_(int)]; int param_size; char param_size_r_[PADR_(int)];
+struct rtprio_thread_args {
+	char function_l_[PADL_(int)]; int function; char function_r_[PADR_(int)];
+	char lwpid_l_[PADL_(lwpid_t)]; lwpid_t lwpid; char lwpid_r_[PADR_(lwpid_t)];
+	char rtp_l_[PADL_(struct rtprio *)]; struct rtprio * rtp; char rtp_r_[PADR_(struct rtprio *)];
 };
 int	nosys(struct thread *, struct nosys_args *);
 void	sys_exit(struct thread *, struct sys_exit_args *);
@@ -1790,9 +1778,7 @@ int	kmq_unlink(struct thread *, struct kmq_unlink_args *);
 int	abort2(struct thread *, struct abort2_args *);
 int	thr_set_name(struct thread *, struct thr_set_name_args *);
 int	aio_fsync(struct thread *, struct aio_fsync_args *);
-int	thr_setscheduler(struct thread *, struct thr_setscheduler_args *);
-int	thr_getscheduler(struct thread *, struct thr_getscheduler_args *);
-int	thr_setschedparam(struct thread *, struct thr_setschedparam_args *);
+int	rtprio_thread(struct thread *, struct rtprio_thread_args *);
 
 #ifdef COMPAT_43
 
@@ -2339,9 +2325,7 @@ int	freebsd4_sigreturn(struct thread *, struct freebsd4_sigreturn_args *);
 #define	SYS_AUE_abort2	AUE_NULL
 #define	SYS_AUE_thr_set_name	AUE_NULL
 #define	SYS_AUE_aio_fsync	AUE_NULL
-#define	SYS_AUE_thr_setscheduler	AUE_NULL
-#define	SYS_AUE_thr_getscheduler	AUE_NULL
-#define	SYS_AUE_thr_setschedparam	AUE_NULL
+#define	SYS_AUE_rtprio_thread	AUE_RTPRIO
 
 #undef PAD_
 #undef PADL_