diff --git a/src/VehicleSetup/PX4FirmwareUpgradeThread.cc b/src/VehicleSetup/PX4FirmwareUpgradeThread.cc
index 7b70c2922463f8ad6f562cbd15833553d89f12ee..5da788997b8859c9094b14c630adcbe3b012c36b 100644
--- a/src/VehicleSetup/PX4FirmwareUpgradeThread.cc
+++ b/src/VehicleSetup/PX4FirmwareUpgradeThread.cc
@@ -119,7 +119,7 @@ void PX4FirmwareUpgradeThreadWorker::_findBoardOnce(void)
 
 bool PX4FirmwareUpgradeThreadWorker::_findBoardFromPorts(QGCSerialPortInfo& portInfo, QGCSerialPortInfo::BoardType_t& boardType, QString& boardName)
 {
-    for (QGCSerialPortInfo info: QGCSerialPortInfo::availablePorts()) {
+    for (const QGCSerialPortInfo& info: QGCSerialPortInfo::availablePorts()) {
         info.getBoardInfo(boardType, boardName);
 
         qCDebug(FirmwareUpgradeVerboseLog) << "Serial Port --------------";