diff --git a/networkDevices/EthLan8720Device.cpp b/networkDevices/EthLan8720Device.cpp
index 2c56464e..cb40ed69 100644
--- a/networkDevices/EthLan8720Device.cpp
+++ b/networkDevices/EthLan8720Device.cpp
@@ -54,7 +54,8 @@ EthLan8720Device::EthLan8720Device(const String& hostname, Preferences* preferen
         _path = new char[200];
         memset(_path, 0, sizeof(_path));
 
-        String pathStr = preferences->getString(preference_mqtt_lock_path);
+        String pathStr = "/";
+        pathStr.concat(preferences->getString(preference_mqtt_lock_path));
         pathStr.concat(mqtt_topic_log);
         strcpy(_path, pathStr.c_str());
         Log = new MqttLogger(this, _path, MqttLoggerMode::MqttAndSerial);
diff --git a/networkDevices/W5500Device.cpp b/networkDevices/W5500Device.cpp
index 615a938b..9591748c 100644
--- a/networkDevices/W5500Device.cpp
+++ b/networkDevices/W5500Device.cpp
@@ -56,7 +56,8 @@ void W5500Device::initialize()
 
     if(_preferences->getBool(preference_mqtt_log_enabled))
     {
-        String pathStr = _preferences->getString(preference_mqtt_lock_path);
+        String pathStr = "/";
+        pathStr.concat(_preferences->getString(preference_mqtt_lock_path));
         pathStr.concat(mqtt_topic_log);
         _path = new char[pathStr.length() + 1];
         memset(_path, 0, sizeof(_path));
diff --git a/networkDevices/WifiDevice.cpp b/networkDevices/WifiDevice.cpp
index bb66d423..7dea816a 100644
--- a/networkDevices/WifiDevice.cpp
+++ b/networkDevices/WifiDevice.cpp
@@ -46,7 +46,8 @@ WifiDevice::WifiDevice(const String& hostname, Preferences* _preferences, const
         _path = new char[200];
         memset(_path, 0, sizeof(_path));
 
-        String pathStr = _preferences->getString(preference_mqtt_lock_path);
+        String pathStr = "/";
+        pathStr.concat(_preferences->getString(preference_mqtt_lock_path));
         pathStr.concat(mqtt_topic_log);
         strcpy(_path, pathStr.c_str());
         Log = new MqttLogger(this, _path, MqttLoggerMode::MqttAndSerial);