diff --git a/salt/bird/bird6.conf b/salt/bird/bird6.conf
index da8b15b..e8c3d7a 100644
--- a/salt/bird/bird6.conf
+++ b/salt/bird/bird6.conf
@@ -18,11 +18,13 @@ protocol radv {
             min ra interval 3;
             max ra interval 10;
 {%-   for ctx, subnets in pillar['subnets-inet6'].items() %}
-{%-     set subnet6 = subnets[iface] %}
+{%-     set subnet6 = subnets.get(iface) %}
+{%-     if subnet6 %]
             prefix {{ subnet6 }} {
                    preferred lifetime 20;
                    valid lifetime 60;
             };
+{%-     endif %}
 {%-   endfor %}
 {%-   if conf.get('rdnss') %}
 {%-     for value in conf['rdnss'] %}