diff --git a/back/lib/ns_update_del b/back/lib/ns_update_del
index 8403077..3856ff0 100755
--- a/back/lib/ns_update_del
+++ b/back/lib/ns_update_del
@@ -21,6 +21,6 @@ source "${CONFIG_FILE}"
 update delete ${1}. AAAA
 update delete *.${1}. CNAME
 send
-update delete $("${LIB_DIR}/ns_update_rev_ipv4" "${2}") PTR.
+update delete $("${LIB_DIR}/ns_update_rev_ipv4" "${2}") PTR
 send
 update delete $("${LIB_DIR}/ns_update_rev_ipv6" "${3}") PTR" || exit 5