diff --git a/etc/namedb/PROTO.localhost.rev b/etc/namedb/PROTO.localhost.rev
index 5b293106348b..046868305455 100644
--- a/etc/namedb/PROTO.localhost.rev
+++ b/etc/namedb/PROTO.localhost.rev
@@ -5,6 +5,8 @@
 ; the /etc/namedb directory.
 ;
 
+$TTL	3600
+
 @	IN	SOA	@host@. root.@host@.  (
 				@date@	; Serial
 				3600	; Refresh