diff --git a/Qv2ray.pro b/Qv2ray.pro
index 789bb7a0..44b37a39 100644
--- a/Qv2ray.pro
+++ b/Qv2ray.pro
@@ -23,7 +23,7 @@ no_increase_build_number {
 DEFINES += QT_DEPRECATED_WARNINGS QV2RAY_VERSION_STRING=\"\\\"v$${VERSION}\\\"\" QAPPLICATION_CLASS=QApplication
 
 # Don't merge those configs with below.
-CONFIG += enable_decoder_qr_code enable_encoder_qr_code qt c++17 openssl-linked
+CONFIG += enable_decoder_qr_code enable_encoder_qr_code qt c++11 openssl-linked
 
 include(3rdparty/qzxing/src/QZXing-components.pri)
 include(3rdparty/SingleApplication/singleapplication.pri)
diff --git a/src/main.cpp b/src/main.cpp
index bc856d4e..707fccd7 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -186,8 +186,9 @@ int main(int argc, char *argv[])
     {
         std::unique_ptr<QCoreApplication> consoleApp(new QCoreApplication(argc, argv));
         QvCommandArgParser parser;
-
-        switch (QString errorMessage; parser.ParseCommandLine(&errorMessage)) {
+        QString errorMessage;
+        
+        switch (parser.ParseCommandLine(&errorMessage)) {
             case CommandLineOk:
                 break;