diff --git a/release/scripts/mm-mtree.sh b/release/scripts/mm-mtree.sh
index d132a34a0e7e..644f309f3c09 100755
--- a/release/scripts/mm-mtree.sh
+++ b/release/scripts/mm-mtree.sh
@@ -81,6 +81,11 @@ if [ ! -f ${SOURCEDIR}/Makefile.inc1 -a \
 fi
 
 # Setup make to use system files from SOURCEDIR
+objp=${MAKEOBJDIRPREFIX}
+[ -z "${objp}" ] && objp=/usr/obj
+legacydir=${objp}${SOURCEDIR}/tmp/legacy
+legacypath=${legacydir}/usr/sbin:${legacydir}/usr/bin:${legacydir}/bin
+MM_MAKE_ARGS="${MM_MAKE_ARGS} PATH=${legacypath}:${PATH}"
 MM_MAKE="make ${ARCHSTRING} ${MM_MAKE_ARGS} -m ${SOURCEDIR}/share/mk"
 
 delete_temproot () {