diff --git a/proxmox/vzdump-hook-hardlink-latest.sh b/proxmox/vzdump-hook-hardlink-latest.sh
index 9fd8b34..b496f9f 100755
--- a/proxmox/vzdump-hook-hardlink-latest.sh
+++ b/proxmox/vzdump-hook-hardlink-latest.sh
@@ -70,7 +70,7 @@ main() {                                                        # {{{
 	# If backup is complete {{{
 	if [ "${phase}" = "backup-end" ]; then
 		## Get TARGET's file extension
-		target_archive_extension="$(printf '%s' "${TARGET}" | cut --delimiter="." --fields=1 --complement)"
+		target_archive_extension="$(printf '%s' "${TARGET}" | sed -n "s/.*\.\([[:alnum:]]*\.[[:alnum:]]*\)$/\1/p")"
 		## Set path for LATEST archive file
 		latest_archive="${dumpdir}/vzdump-${vmtype}-${vmid}-latest.${target_archive_extension}"