diff --git a/src/pulsar-consumer.js b/src/pulsar-consumer.js
index b3d0646..55ecc53 100644
--- a/src/pulsar-consumer.js
+++ b/src/pulsar-consumer.js
@@ -89,7 +89,7 @@ module.exports = function(RED) {
             //if the buffer is empty, the message is not a json object
             const nodeMessage = {
                 topic: pulsarMessage.getTopicName(),
-                messageId: pulsarMessage.getMessageId(),
+                messageId: pulsarMessage.getMessageId().toString(),
                 publishTime: pulsarMessage.getPublishTimestamp(),
                 eventTime: pulsarMessage.getEventTimestamp(),
                 redeliveryCount: pulsarMessage.getRedeliveryCount(),