diff --git a/sys/compat/linux/linux_fork.h b/sys/compat/linux/linux_fork.h
index bdc201bce57e..2a6e2a158241 100644
--- a/sys/compat/linux/linux_fork.h
+++ b/sys/compat/linux/linux_fork.h
@@ -1,101 +1,103 @@
 /*-
  * Copyright (c) 2021 Dmitry Chagin <dchagin@FreeBSD.org>
  *
  * 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.
  * 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.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
  *
  * $FreeBSD$
  */
 
 #ifndef _LINUX_FORK_H_
 #define _LINUX_FORK_H_
 
 #define	LINUX_CLONE_VM			0x00000100
 #define	LINUX_CLONE_FS			0x00000200
 #define	LINUX_CLONE_FILES		0x00000400
 #define	LINUX_CLONE_SIGHAND		0x00000800
 #define	LINUX_CLONE_PIDFD		0x00001000	/* since Linux 5.2 */
 #define	LINUX_CLONE_PTRACE		0x00002000
 #define	LINUX_CLONE_VFORK		0x00004000
 #define	LINUX_CLONE_PARENT		0x00008000
 #define	LINUX_CLONE_THREAD		0x00010000
 #define	LINUX_CLONE_NEWNS		0x00020000	/* New mount NS */
 #define	LINUX_CLONE_SYSVSEM		0x00040000
 #define	LINUX_CLONE_SETTLS		0x00080000
 #define	LINUX_CLONE_PARENT_SETTID	0x00100000
 #define	LINUX_CLONE_CHILD_CLEARTID	0x00200000
 #define	LINUX_CLONE_DETACHED		0x00400000	/* Unused */
 #define	LINUX_CLONE_UNTRACED		0x00800000
 #define	LINUX_CLONE_CHILD_SETTID	0x01000000
 #define	LINUX_CLONE_NEWCGROUP		0x02000000	/* New cgroup NS */
 #define	LINUX_CLONE_NEWUTS		0x04000000
 #define	LINUX_CLONE_NEWIPC		0x08000000
 #define	LINUX_CLONE_NEWUSER		0x10000000
 #define	LINUX_CLONE_NEWPID		0x20000000
 #define	LINUX_CLONE_NEWNET		0x40000000
 #define	LINUX_CLONE_IO			0x80000000
 
 /* Flags for the clone3() syscall. */
 #define	LINUX_CLONE_CLEAR_SIGHAND	0x100000000ULL
 #define	LINUX_CLONE_INTO_CGROUP		0x200000000ULL
 #define	LINUX_CLONE_NEWTIME		0x00000080
 
 #define	LINUX_CLONE_LEGACY_FLAGS	0xffffffffULL
 
 #define	LINUX_CSIGNAL			0x000000ff
 
+#if defined(_KERNEL)
 /*
  * User-space clone3 args layout.
  */
 struct l_user_clone_args {
 	uint64_t flags;
 	uint64_t pidfd;
 	uint64_t child_tid;
 	uint64_t parent_tid;
 	uint64_t exit_signal;
 	uint64_t stack;
 	uint64_t stack_size;
 	uint64_t tls;
 	uint64_t set_tid;
 	uint64_t set_tid_size;
 	uint64_t cgroup;
 };
 
 /*
  * Kernel clone3 args layout.
  */
 struct l_clone_args {
 	uint64_t flags;
 	l_int *child_tid;
 	l_int *parent_tid;
 	l_int exit_signal;
 	l_ulong stack;
 	l_ulong stack_size;
 	l_ulong tls;
 };
 
 #define	LINUX_CLONE_ARGS_SIZE_VER0	64
 
 int linux_set_upcall(struct thread *, register_t);
 int linux_set_cloned_tls(struct thread *, void *);
 void linux_thread_detach(struct thread *);
+#endif /* defined(_KERNEL) */
 
 #endif /* _LINUX_FORK_H_ */