diff --git a/package/network/services/hostapd/files/hostapd.sh b/package/network/services/hostapd/files/hostapd.sh
index ce0f2271de..f856a0b739 100644
--- a/package/network/services/hostapd/files/hostapd.sh
+++ b/package/network/services/hostapd/files/hostapd.sh
@@ -196,6 +196,9 @@ hostapd_set_bss_options() {
 		config_get manufacturer "$vif" wps_manufacturer "openwrt.org"
 		config_get wps_pin "$vif" wps_pin "12345670"
 
+		config_get_bool ext_registrar "$vif" ext_registrar 0
+		[ "$ext_registrar" -gt 0 -a -n "$bridge" ] && append "$var" "upnp_iface=$bridge" "$N"
+
 		append "$var" "eap_server=1" "$N"
 		append "$var" "ap_pin=$wps_pin" "$N"
 		append "$var" "wps_state=${wps_not_configured:-2}" "$N"