diff --git a/sys/amd64/linux/linux_sysvec.c b/sys/amd64/linux/linux_sysvec.c
--- a/sys/amd64/linux/linux_sysvec.c
+++ b/sys/amd64/linux/linux_sysvec.c
@@ -65,7 +65,6 @@
 #include <compat/linux/linux_mib.h>
 #include <compat/linux/linux_misc.h>
 #include <compat/linux/linux_signal.h>
-#include <compat/linux/linux_sysproto.h>
 #include <compat/linux/linux_util.h>
 #include <compat/linux/linux_vdso.h>
 
diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c
--- a/sys/compat/linux/linux_misc.c
+++ b/sys/compat/linux/linux_misc.c
@@ -79,7 +79,6 @@
 #include <compat/linux/linux_signal.h>
 #include <compat/linux/linux_time.h>
 #include <compat/linux/linux_util.h>
-#include <compat/linux/linux_sysproto.h>
 #include <compat/linux/linux_emul.h>
 #include <compat/linux/linux_misc.h>
 
@@ -1506,13 +1505,6 @@
 	return (kern_getsid(td, args->pid));
 }
 
-int
-linux_nosys(struct thread *td, struct nosys_args *ignore)
-{
-
-	return (ENOSYS);
-}
-
 int
 linux_getpriority(struct thread *td, struct linux_getpriority_args *args)
 {
diff --git a/sys/compat/linux/linux_sysproto.h b/sys/compat/linux/linux_sysproto.h
--- a/sys/compat/linux/linux_sysproto.h
+++ b/sys/compat/linux/linux_sysproto.h
@@ -1,36 +0,0 @@
-/*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (c) 2005 Travis Poppe
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer
- *    in this position and unchanged.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- *    derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef LINUX_SYSPROTO
-#define LINUX_SYSPROTO
-
-int linux_nosys(struct thread *, struct nosys_args *);
-
-#endif