diff --git a/sys/sys/sndstat.h b/sys/sys/sndstat.h
index 8a49042b0453..e0e403b1a72a 100644
--- a/sys/sys/sndstat.h
+++ b/sys/sys/sndstat.h
@@ -1,107 +1,107 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause
  *
  * Copyright (c) 2020 The FreeBSD Foundation
  *
  * This software was developed by Ka Ho Ng
  * 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, 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.
  */
 
 #ifndef _SYS_SNDSTAT_H_
 #define _SYS_SNDSTAT_H_
 
 #include <sys/types.h>
 #ifndef _IOWR
 #include <sys/ioccom.h>
 #endif  /* !_IOWR */
 
 struct sndstioc_nv_arg {
 	size_t nbytes;	/* [IN/OUT] buffer size/number of bytes filled */
 	void *buf;	/* [OUT] buffer holding a packed nvlist */
 };
 
 /*
  * Common name/value pair names
  */
 #define SNDST_DSPS			"dsps"
 #define SNDST_DSPS_FROM_USER		"from_user"
 #define SNDST_DSPS_PCHAN		"pchan"
 #define SNDST_DSPS_RCHAN		"rchan"
 #define SNDST_DSPS_NAMEUNIT		"nameunit"
 #define SNDST_DSPS_DEVNODE		"devnode"
 #define SNDST_DSPS_DESC			"desc"
 #define SNDST_DSPS_PROVIDER		"provider"
 #define SNDST_DSPS_PROVIDER_INFO	"provider_info"
 
 /*
  * Common name/value pair names for play/rec info
  */
 #define SNDST_DSPS_INFO_PLAY		"info_play"
 #define SNDST_DSPS_INFO_REC		"info_rec"
 #define SNDST_DSPS_INFO_MIN_RATE	"min_rate"
 #define SNDST_DSPS_INFO_MAX_RATE	"max_rate"
 #define SNDST_DSPS_INFO_FORMATS		"formats"
 #define SNDST_DSPS_INFO_MIN_CHN		"min_chn"
 #define SNDST_DSPS_INFO_MAX_CHN		"max_chn"
 
 /*
  * sound(4)-specific name/value pair names
  */
 #define SNDST_DSPS_SOUND4_PROVIDER	"sound(4)"
 #define SNDST_DSPS_SOUND4_UNIT		"unit"
 #define SNDST_DSPS_SOUND4_BITPERFECT	"bitperfect"
 #define SNDST_DSPS_SOUND4_PVCHAN	"pvchan"
 #define SNDST_DSPS_SOUND4_RVCHAN	"rvchan"
 
 /*
  * Maximum user-specified nvlist buffer size
  */
-#define SNDST_UNVLBUF_MAX		65535
+#define SNDST_UNVLBUF_MAX		65536
 
 #define SNDSTIOC_REFRESH_DEVS \
 	_IO('D', 100)
 #define SNDSTIOC_GET_DEVS \
 	_IOWR('D', 101, struct sndstioc_nv_arg)
 #define SNDSTIOC_ADD_USER_DEVS \
 	_IOWR('D', 102, struct sndstioc_nv_arg)
 #define SNDSTIOC_FLUSH_USER_DEVS \
 	_IO('D', 103)
 
 #ifdef _KERNEL
 #ifdef COMPAT_FREEBSD32
 
 struct sndstioc_nv_arg32 {
 	uint32_t nbytes;
 	uint32_t buf;
 };
 
 #define SNDSTIOC_GET_DEVS32 \
 	_IOC_NEWTYPE(SNDSTIOC_GET_DEVS, struct sndstioc_nv_arg32)
 #define SNDSTIOC_ADD_USER_DEVS32 \
 	_IOC_NEWTYPE(SNDSTIOC_ADD_USER_DEVS, struct sndstioc_nv_arg32)
 
 #endif
 #endif
 
 #endif /* !_SYS_SNDSTAT_H_ */