diff --git a/bundles/radvd/files/radvd.conf b/bundles/radvd/files/radvd.conf
index 156a262..ee7f4b6 100644
--- a/bundles/radvd/files/radvd.conf
+++ b/bundles/radvd/files/radvd.conf
@@ -11,7 +11,7 @@ interface ${interface}
         AdvAutonomous on;
         AdvRouterAddr on;
     };
-% if 'rdnss' in config:
+% if config.get('rdnss'):
     RDNSS ${' '.join(sorted(config['rdnss']))}
     {
         AdvRDNSSLifetime 45;