diff --git a/sbin/reboot/nextboot.sh b/sbin/reboot/nextboot.sh
index 849d7a377714..2350c42516bf 100644
--- a/sbin/reboot/nextboot.sh
+++ b/sbin/reboot/nextboot.sh
@@ -1,133 +1,133 @@
 #! /bin/sh
 #
 # SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 #
 # Copyright (c) 2002 Gordon Tetlow. All rights reserved.
 # Copyright (c) 2012 Sandvine Incorporated. 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.
 # 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.
 #
 # $FreeBSD$
 
 append="NO"
 delete="NO"
 kenv=
 force="NO"
 nextboot_file="/boot/nextboot.conf"
 zfs=
 
 add_kenv()
 {
 	local var value
 
 	var=$1
 	# strip literal quotes if passed in
 	value=${2%\"*}
 	value=${value#*\"}
 
 	if [ -n "${kenv}" ]; then
 		kenv="${kenv}
 "
 	fi
 	kenv="${kenv}${var}=\"${value}\""
 }
 
 display_usage() {
 	cat <<-EOF
 	Usage: nextboot [-af] [-e variable=value] [-k kernel] [-o options]
 	       nextboot -D
 	EOF
 }
 
 while getopts "aDe:fk:o:" argument ; do
 	case "${argument}" in
 	a)
 		append="YES"
 		;;
 	D)
 		delete="YES"
 		;;
 	e)
 		var=${OPTARG%%=*}
 		value=${OPTARG#*=}
 		if [ -z "$var" -o -z "$value" ]; then
 			display_usage
 			exit 1
 		fi
 		add_kenv "$var" "$value"
 		;;
 	f)
 		force="YES"
 		;;
 	k)
 		kernel="${OPTARG}"
 		add_kenv kernel "$kernel"
 		;;
 	o)
 		add_kenv kernel_options "${OPTARG}"
 		;;
 	*)
 		display_usage
 		exit 1
 		;;
 	esac
 done
 
 if [ ${delete} = "YES" ]; then
 	rm -f ${nextboot_file}
 	exit 0
 fi
 
 if [ -z "${kenv}" ]; then
 	display_usage
 	exit 1
 fi
 
 if [ -n "${kernel}" -a ${force} = "NO" -a ! -d /boot/${kernel} ]; then
 	echo "Error: /boot/${kernel} doesn't exist. Use -f to override."
 	exit 1
 fi
 
 zfs=$(df -Tn "/boot/" 2>/dev/null | while read _fs _type _other ; do
 	[ "zfs" = "${_type}" ] || continue
-	echo "${_fs%/ROOT/*}"
+	echo "${_fs%%/*}"
 done)
 
 set -e
 
 nextboot_tmp=$(mktemp $(dirname ${nextboot_file})/nextboot.XXXXXX)
 
 if [ -n "${zfs}" ]; then
 	zfsbootcfg -z ${zfs} -n freebsd:nvstore -k nextboot_enable -v YES
 	cat >> ${nextboot_tmp} << EOF
 $kenv
 EOF
 else
 cat >> ${nextboot_tmp} << EOF
 nextboot_enable="YES"
 $kenv
 EOF
 fi
 
 fsync ${nextboot_tmp}
 
 mv ${nextboot_tmp} ${nextboot_file}