diff --git a/package/base-files/files/bin/firstboot b/package/base-files/files/bin/firstboot
index 5c11623b488..ad87f7482e5 100755
--- a/package/base-files/files/bin/firstboot
+++ b/package/base-files/files/bin/firstboot
@@ -49,7 +49,7 @@ pivot() { # <new_root> <old_root>
 fopivot() { # <rw_root> <ro_root> <dupe?>
 	root=$1
 	{
-		mount -t mini_fo -o base=/,sto=$1 $1 /mnt 2>&- && root=/mnt
+		mount -t mini_fo -o base=/,sto=$1 "mini_fo:$1" /mnt 2>&- && root=/mnt
 	} || {
 		[ "$3" = "1" ] && {
 		mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1