diff --git a/server/options.go b/server/options.go
index 5caba936..63b895bb 100644
--- a/server/options.go
+++ b/server/options.go
@@ -60,6 +60,10 @@ func newOptions(opt ...Option) Options {
 		o(&opts)
 	}
 
+	if opts.Auth == nil {
+		opts.Auth = auth.DefaultAuth
+	}
+
 	if opts.Broker == nil {
 		opts.Broker = broker.DefaultBroker
 	}