diff --git a/Debian-Buster-Root-on-ZFS.md b/Debian-Buster-Root-on-ZFS.md
index ed9b69e..120c9b8 100644
--- a/Debian-Buster-Root-on-ZFS.md
+++ b/Debian-Buster-Root-on-ZFS.md
@@ -498,6 +498,7 @@ Everything else applies to both BIOS and UEFI booting:
     echo bpool/BOOT/debian /boot zfs \
         nodev,relatime,x-systemd.requires=zfs-import-bpool.service 0 0 >> /etc/fstab
 
+    mkdir /var/lock
     mkdir /etc/zfs/zfs-list.cache
     touch /etc/zfs/zfs-list.cache/rpool
     ln -s /usr/lib/zfs-linux/zed.d/history_event-zfs-list-cacher.sh /etc/zfs/zed.d