diff --git a/roles/dokuwiki/templates/backup.sh b/roles/dokuwiki/templates/backup.sh
index e6a176a..3453bee 100644
--- a/roles/dokuwiki/templates/backup.sh
+++ b/roles/dokuwiki/templates/backup.sh
@@ -27,7 +27,7 @@ fi
 # Purge oldest backup if we need to
 currentbackupcount="$(ls -1 "$OUTDIR" | wc -l)"
 if (( currentbackupcount >= retention )); then
-	lastbackup="$(find "$OUTDIR" -name \*.zip 2>/dev/null | sort | head -n 1)"
+	lastbackup="$(find "$OUTDIR" -name \*.tar.gz 2>/dev/null | sort | head -n 1)"
 	if [ -f "$lastbackup" ]; then
 		log "Removing old backup: $lastbackup"
 		rm "$lastbackup"