diff --git a/lib/dns/include/dns/events.h b/lib/dns/include/dns/events.h
index c3e0f05070..17282bce8e 100644
--- a/lib/dns/include/dns/events.h
+++ b/lib/dns/include/dns/events.h
@@ -46,6 +46,7 @@ ISC_LANG_BEGINDECLS
 #define DNS_EVENT_BYADDRDONE			(ISC_EVENTCLASS_DNS + 16)
 #define DNS_EVENT_ZONECONTROL			(ISC_EVENTCLASS_DNS + 17)
 #define DNS_EVENT_DBDESTROYED			(ISC_EVENTCLASS_DNS + 18)
+#define DNS_EVENT_VALIDATORDONE			(ISC_EVENTCLASS_DNS + 19)
 
 #define DNS_EVENT_FIRSTEVENT			(ISC_EVENTCLASS_DNS + 0)
 #define DNS_EVENT_LASTEVENT			(ISC_EVENTCLASS_DNS + 65535)