diff --git a/post-debootstrap-installer.sh b/post-debootstrap-installer.sh
index bc831a7..a8c1bbf 100755
--- a/post-debootstrap-installer.sh
+++ b/post-debootstrap-installer.sh
@@ -51,7 +51,7 @@ else
 fi
 
 # edit uuids in fstab
-root_uuid=$(blkid --output value "/dev/mapper/root-unlocked" | head -n1)
+root_uuid=$(blkid --output value "$(cryptsetup status root-unlocked | grep device | perl -pe 's#.*device.* (.*)#$1#')" | head -n1)
 boot_uuid=$(blkid --output value "/hardware-setup/hardware/${1}/boot" | head -n1)
 esp_uuid=$(blkid --output value "/hardware-setup/hardware/${1}/esp" | head -n1)
 sed -i "s/%root_uuid%/${root_uuid}/" /etc/crypttab