diff --git a/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js b/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
index afa0066f4..451035a74 100644
--- a/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
+++ b/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
@@ -675,7 +675,7 @@ module.exports = function(RED) {
             node.options.password = node.password;
             node.options.keepalive = node.keepalive;
             node.options.clean = node.cleansession;
-            node.options.clientId = node.clientid || 'nodered_' + RED.util.generateId();
+            node.options.clientId = node.clientid || 'nodered' + RED.util.generateId();
             node.options.reconnectPeriod = RED.settings.mqttReconnectTime||5000;
             delete node.options.protocolId; //V4+ default
             delete node.options.protocolVersion; //V4 default