diff --git a/lib/mqtt.js b/lib/mqtt.js
index d6e5d23f7..fcbc21282 100644
--- a/lib/mqtt.js
+++ b/lib/mqtt.js
@@ -30,6 +30,11 @@ class MQTT {
             options.clientId = mqttSettings.client_id;
         }
 
+        if (mqttSettings.hasOwnProperty('reject_unauthorized') && !mqttSettings.reject_unauthorized) {
+            logger.debug(`MQTT reject_unauthorized set false, ignoring certificate warnings.`);
+            options.rejectUnauthorized = false;
+        }
+
         this.client = mqtt.connect(mqttSettings.server, options);
 
         // Register callbacks.