diff --git a/QtScrcpy/dialog.cpp b/QtScrcpy/dialog.cpp
index 4678922..e9b56e3 100644
--- a/QtScrcpy/dialog.cpp
+++ b/QtScrcpy/dialog.cpp
@@ -132,8 +132,6 @@ void Dialog::initUI()
 
     updateBootConfig(true);
 
-    ui->userNameEdt->setText(Config::getInstance().getNickName(ui->serialBox->currentText()));
-
     on_useSingleModeCheck_clicked();
 
     on_updateDevice_clicked();
@@ -622,3 +620,8 @@ void Dialog::on_useSingleModeCheck_clicked()
         ui->usbGroupBox->show();
     }
 }
+
+void Dialog::on_serialBox_currentIndexChanged(const QString &arg1)
+{
+    ui->userNameEdt->setText(Config::getInstance().getNickName(arg1));
+}
diff --git a/QtScrcpy/dialog.h b/QtScrcpy/dialog.h
index 9a5ec57..b29d123 100644
--- a/QtScrcpy/dialog.h
+++ b/QtScrcpy/dialog.h
@@ -73,6 +73,8 @@ private slots:
 
     void on_useSingleModeCheck_clicked();
 
+    void on_serialBox_currentIndexChanged(const QString &arg1);
+
 private:
     bool checkAdbRun();
     void initUI();