diff --git a/xCAT-server/share/xcat/netboot/rh/dracut/xcat-prepivot.sh b/xCAT-server/share/xcat/netboot/rh/dracut/xcat-prepivot.sh
index 22b0bc9b6..5c6256df6 100755
--- a/xCAT-server/share/xcat/netboot/rh/dracut/xcat-prepivot.sh
+++ b/xCAT-server/share/xcat/netboot/rh/dracut/xcat-prepivot.sh
@@ -46,11 +46,11 @@ if [ ! -z $SNAPSHOTSERVER ]; then
     mkdir -p $NEWROOT/$RWDIR/persistent
     MAXTRIES=5
     ITER=0
-	if [ -z $MNTOPTS ]; then
-		MNT_OPTIONS="nolock,rsize=32768,tcp,timeo=14"
-	else
-		MNT_OPTIONS=$MNTOPTS
-	fi
+    if [ -z $MNTOPTS ]; then
+        MNT_OPTIONS="nolock,rsize=32768,tcp,nfsvers=3,timeo=14"
+    else
+        MNT_OPTIONS=$MNTOPTS
+    fi
     while ! mount $SNAPSHOTSERVER:/$SNAPSHOTROOT  $NEWROOT/$RWDIR/persistent -o $MNT_OPTIONS; do
         ITER=$(( ITER + 1 ))
         if [ "$ITER" == "$MAXTRIES" ]; then