diff --git a/libexec/rc/rc.initdiskless b/libexec/rc/rc.initdiskless
--- a/libexec/rc/rc.initdiskless
+++ b/libexec/rc/rc.initdiskless
@@ -208,9 +208,9 @@
 # $1 is size in 512-byte sectors, $2 is the mount point.
 mount_md() {
     if [ ${o_verbose} -gt 0 ] ; then
-        /sbin/mdmfs -XL -s $1 auto $2
+        /sbin/mdmfs -XL -S -s $1 auto $2
     else
-        /sbin/mdmfs -s $1 auto $2
+        /sbin/mdmfs -S -s $1 auto $2
     fi
 }