diff --git a/lib/dns/include/dns/byaddr.h b/lib/dns/include/dns/byaddr.h
index 81da5e4e85..dd93886f4e 100644
--- a/lib/dns/include/dns/byaddr.h
+++ b/lib/dns/include/dns/byaddr.h
@@ -58,11 +58,12 @@ ISC_LANG_BEGINDECLS
 
 typedef struct dns_byaddrevent {
 	ISC_EVENT_COMMON(struct dns_byaddrevent);
-	dns_byaddr_t *			byaddr;
 	isc_result_t			result;
 	dns_namelist_t			names;
 } dns_byaddrevent_t;
 
+#define DNS_BYADDROPT_IPV6NIBBLE	0x0001
+
 isc_result_t
 dns_byaddr_create(isc_mem_t *mctx, isc_netaddr_t *address, dns_view_t *view,
 		  unsigned int options, isc_task_t *task,