diff --git a/Tools/scripts/gen-compat.sh b/Tools/scripts/gen-compat.sh
index 55f93173ef8d..6b76ee8a33cb 100644
--- a/Tools/scripts/gen-compat.sh
+++ b/Tools/scripts/gen-compat.sh
@@ -1,64 +1,64 @@
 #!/bin/sh
 
 set -eu
 set -o pipefail
 
 prog=${0##*/}
 
 usage()
 {
 	echo "Usage $prog <version> <arch> <filelist>" >&2
 	exit 1
 }
 
 if [ $# -ne 3 ]; then
 	usage
 fi
 
 version=${1}
 arch=${2}
 filelist=${3}
 
 if [ ! -f ${filelist} ]; then
 	echo "filelist if not a file" >&2
 	usage
 fi
 
 case $arch in
 amd64)
 	sets="base lib32" ;;
 *)
 	sets="base" ;;
 esac
 
 flist=""
 while read l ; do
 	flist="$flist */$l"
 done <$filelist
 
 tmpdir=$(mktemp -d)
 trap "rm -rf $tmpdir" 0 1 2 3 15
 mkdir -p ${tmpdir}/base
 set -o noglob
 for s in $sets; do
 	echo "Fetching $s for ${version}"
 	extract_list="$flist"
 	if [ $s = "base" ]; then
 		extract_list="${extract_list} */sys/param.h"
 	fi
 	fetch -o - https://download.freebsd.org/releases/${arch}/${version}-RELEASE/${s}.txz | tar -C ${tmpdir}/base -x -f - $extract_list
 done
 set +o noglob
 fbsd_version=$(awk '/#define __FreeBSD_version/ { print $3 }' ${tmpdir}/base/usr/include/sys/param.h)
 maj_version=${version%%.*}
 date=$(date "+%Y%m%d")
 compatdir="compat${maj_version}x-${arch}-${version}.${fbsd_version}.${date}"
 mkdir -p ${tmpdir}/${compatdir}/lib/compat
 case $sets in
 *lib32*)
 	mkdir -p ${tmpdir}/${compatdir}/lib32/compat
 	find ${tmpdir}/base/usr/lib32/ -name "*.so.*" -exec mv -v {} ${tmpdir}/${compatdir}/lib32/compat/ \;
 	;;
 esac
 find ${tmpdir}/base -name "*.so.*" -exec mv -v {} ${tmpdir}/${compatdir}/lib/compat/ \;
-tar -cvJf ${compatdir}.tar.xz ${tmpdir}/${compatdir}
+tar -cvJf ${compatdir}.tar.xz -C ${tmpdir} ${compatdir}