diff --git a/src/MqttPlugin.cpp b/src/MqttPlugin.cpp
index a505053..06ed736 100644
--- a/src/MqttPlugin.cpp
+++ b/src/MqttPlugin.cpp
@@ -55,8 +55,9 @@ void MqttPlugin::connect()
 void MqttPlugin::upstreamHandler(String topic, String msg)
 {
     // publish message on remote queue
-    PRINT_MSG(Serial, "MQTT", String("publish remote: " + topic).c_str());
-    client->publish((String(mqttConfig.outTopicRoot) + topic).c_str(), msg.c_str());
+    String remoteTopic = String(mqttConfig.outTopicRoot) + topic;
+    client->publish(remoteTopic.c_str(), msg.c_str());
+    PRINT_MSG(Serial, "MQTT", String("publish remote: " + remoteTopic).c_str());
 }
 
 void MqttPlugin::downstreamHandler(char *topic, uint8_t *payload, unsigned int length)