diff --git a/bin/named/zoneconf.c b/bin/named/zoneconf.c
index 785d392e7b..f151c45845 100644
--- a/bin/named/zoneconf.c
+++ b/bin/named/zoneconf.c
@@ -1432,6 +1432,7 @@ named_zone_configure(const cfg_obj_t *config, const cfg_obj_t *vconfig,
 		INSIST(result == ISC_R_SUCCESS);
 		dns_zone_setrequestixfr(zone, cfg_obj_asboolean(obj));
 
+		obj = NULL;
 		checknames(ztype, maps, &obj);
 		INSIST(obj != NULL);
 		if (strcasecmp(cfg_obj_asstring(obj), "warn") == 0) {