diff --git a/sys/compat/linuxkpi/common/include/linux/build_bug.h b/sys/compat/linuxkpi/common/include/linux/build_bug.h
index 59d1fc228afc..6a026376cfc8 100644
--- a/sys/compat/linuxkpi/common/include/linux/build_bug.h
+++ b/sys/compat/linuxkpi/common/include/linux/build_bug.h
@@ -1,65 +1,65 @@
 /*-
  * Copyright (c) 2017 Mark Johnston <markj@FreeBSD.org>
  * Copyright (c) 2018 Johannes Lundberg <johalun0@gmail.com>
  * Copyright (c) 2021 The FreeBSD Foundation
  * Copyright (c) 2021 Vladimir Kondratyev <wulf@FreeBSD.org>
  * Copyright (c) 2023 Serenity Cyber Security, LLC
  *
  * Portions of this software were developed by Bjoern A. Zeeb
  * under sponsorship from the FreeBSD Foundation.
  *
  * 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 unmodified, 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 ``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	_LINUXKPI_LINUX_BUILD_BUG_H_
 #define	_LINUXKPI_LINUX_BUILD_BUG_H_
 
 #include <sys/param.h>
 
 #include <linux/compiler.h>
 
 /*
  * BUILD_BUG_ON() can happen inside functions where _Static_assert() does not
  * seem to work.  Use old-schoold-ish CTASSERT from before commit
  * a3085588a88fa58eb5b1eaae471999e1995a29cf but also make sure we do not
  * end up with an unused typedef or variable. The compiler should optimise
  * it away entirely.
  */
 #define	_O_CTASSERT(x)		_O__CTASSERT(x, __LINE__)
 #define	_O__CTASSERT(x, y)	_O___CTASSERT(x, y)
 #define	_O___CTASSERT(x, y)	while (0) { \
     typedef char __assert_line_ ## y[(x) ? 1 : -1]; \
-    __assert_line_ ## y _x; \
+    __assert_line_ ## y _x __unused; \
     _x[0] = '\0'; \
 }
 
 #define	BUILD_BUG()			do { CTASSERT(0); } while (0)
 #define	BUILD_BUG_ON(x)			do { _O_CTASSERT(!(x)) } while (0)
 #define	BUILD_BUG_ON_MSG(x, msg)	BUILD_BUG_ON(x)
 #define	BUILD_BUG_ON_NOT_POWER_OF_2(x)	BUILD_BUG_ON(!powerof2(x))
 #define	BUILD_BUG_ON_INVALID(expr)	while (0) { (void)(expr); }
 #define	BUILD_BUG_ON_ZERO(x)	((int)sizeof(struct { int:-((x) != 0); }))
 
 #define static_assert(x, ...)		__static_assert(x, ##__VA_ARGS__, #x)
 #define __static_assert(x, msg, ...)	_Static_assert(x, msg)
 
 #endif