diff --git a/lib/mqtt.js b/lib/mqtt.js
index b00d5501d..b2caf96fd 100644
--- a/lib/mqtt.js
+++ b/lib/mqtt.js
@@ -44,8 +44,11 @@ class MQTT extends events.EventEmitter {
         }
 
         if (mqttSettings.user && mqttSettings.password) {
+            logger.debug(`Using MQTT login with username: ${mqttSettings.user}`);
             options.username = mqttSettings.user;
             options.password = mqttSettings.password;
+        } else {
+            logger.debug(`Using MQTT anonymous login`);
         }
 
         if (mqttSettings.client_id) {