diff --git a/lib/dns/catz.c b/lib/dns/catz.c
index 775e54c0e1..2a403f9585 100644
--- a/lib/dns/catz.c
+++ b/lib/dns/catz.c
@@ -508,6 +508,8 @@ dns_catz_zones_merge(dns_catz_zone_t *target, dns_catz_zone_t *newzone) {
 	{
 		dns_catz_entry_t *entry;
 		isc_ht_iter_current(itermod, (void **) &entry);
+
+		dns_name_format(&entry->name, zname, DNS_NAME_FORMATSIZE);
 		result = modzone(entry, target, target->catzs->view,
 				 target->catzs->taskmgr,
 				 target->catzs->zmm->udata);