diff --git a/src/bin/dual-iir.rs b/src/bin/dual-iir.rs
index 97ea9b3..e5ff197 100644
--- a/src/bin/dual-iir.rs
+++ b/src/bin/dual-iir.rs
@@ -63,7 +63,7 @@ const APP: () = {
         let mqtt_interface = {
             let mqtt_client = {
                 let broker = IpAddr::V4(Ipv4Addr::new(10, 34, 16, 1));
-                minimq::MqttClient::new(broker, None, stabilizer.net.stack)
+                minimq::MqttClient::new(broker, "", stabilizer.net.stack)
                     .unwrap()
             };