diff --git a/release/sparc64/mkisoimages.sh b/release/sparc64/mkisoimages.sh
index 323531e2fc52..7ab204d402b4 100644
--- a/release/sparc64/mkisoimages.sh
+++ b/release/sparc64/mkisoimages.sh
@@ -24,17 +24,16 @@
 # into base-bits-dir as part of making the image.
 
 IMG=/tmp/bootfs
-LOADER=/boot/loader
 MNT=/mnt
 
 if [ "x$1" = "x-b" ]; then
 	dd if=/dev/zero of=${IMG} bs=512 count=1024
 	MD=`mdconfig -a -t vnode -f ${IMG}`
-	sunlabel -Brw ${MD} auto
-	newfs /dev/${MD}c
+	sunlabel -w -B -b $4/boot/boot1 ${MD} auto
+	newfs -O1 -o space -m 0 /dev/${MD}c
 	mount /dev/${MD}c ${MNT}
 	mkdir ${MNT}/boot
-	cp ${LOADER} ${MNT}/boot
+	cp $4/boot/loader ${MNT}/boot
 	umount ${MNT}
 	mdconfig -d -u ${MD#md}
 	bootable="-B ,,,,${IMG}"