diff --git a/zfs-backup-mm b/zfs-backup-mm
index 9a64892..433a6b8 100755
--- a/zfs-backup-mm
+++ b/zfs-backup-mm
@@ -1,6 +1,13 @@
 #!/bin/bash
+if [ -z "$2" ]
+then
+lock_variable="/var/lock/zfs-backup-mm"
+else
+lock_variable="$2"
+fi
+
 (
-     flock -n 200 || { echo 'locked via flock on file /var/lock/zfs-backup-mm' ; exit 1; }
+     flock -n 200 || { echo "locked via flock on file $lock_variable" ; exit 1; }
 
 zfsnap_block () {
 
@@ -78,4 +85,4 @@ if [[ $# -eq 0 ]] ; then
 fi
 	source $1
 	zfsnap_block
-) 200>/var/lock/zfs-backup-mm
+) 200>$lock_variable