diff --git a/tools/boot/lua-img.sh b/tools/boot/lua-img.sh
index 9693c726501d..85e4cfc304d9 100755
--- a/tools/boot/lua-img.sh
+++ b/tools/boot/lua-img.sh
@@ -1,26 +1,26 @@
 #!/bin/sh
 # $FreeBSD$
 
 # Quick script to build a suitable /boot dir somewhere in the tree for testing.
 # dir may be passed in, will default to /tmp/loadertest if not specified
 
 die() {
     echo $*
     exit 1
 }
 
 dir=$1
 cd $(make -V SRCTOP)
 
 [ -n "$dir" ] || dir=/tmp/loadertest
 
 set -e
 
 rm -rf ${dir}
 mkdir -p ${dir}
 mtree -deUW -f etc/mtree/BSD.root.dist -p ${dir}
 mtree -deUW -f etc/mtree/BSD.usr.dist -p ${dir}/usr
 cd stand
-make all install DESTDIR=${dir} NO_ROOT=t MK_LOADER_LUA=yes MK_FORTH=no MK_INSTALL_AS_USER=yes
+make -j4 all install DESTDIR=${dir} NO_ROOT=t MK_LOADER_LUA=yes MK_FORTH=no MK_INSTALL_AS_USER=yes
 mkdir -p ${dir}/boot/kernel
 cp /boot/kernel/kernel ${dir}/boot/kernel