diff --git a/DeviceConnection.cpp b/DeviceConnection.cpp
index a7fc53c..4be6fec 100644
--- a/DeviceConnection.cpp
+++ b/DeviceConnection.cpp
@@ -1,6 +1,7 @@
 #include "DeviceConnection.h"
 #include "BoostLog.h"
 #include "StringUtility.h"
+#include <QFileInfo>
 #include <QPointF>
 #include <QTimer>
 #include <WinSock2.h>
@@ -362,7 +363,8 @@ void DeviceConnection::requestOta(const QString &firmware, const QString &file)
         request["deviceid"] = "0";
         boost::json::object data;
         data["target_linux04_firmware"] = firmware.toStdString();
-        data["datasize"] = std::filesystem::file_size(file.toStdString());
+        QFileInfo fileInfo(file);
+        data["datasize"] = fileInfo.size();
         data["md5"] = oss.str();
         request["data"] = std::move(data);
         auto text = boost::json::serialize(request);