diff --git a/src/lib/cooperation/core/gui/mainwindow.cpp b/src/lib/cooperation/core/gui/mainwindow.cpp
index 9619f402..3717d1d2 100644
--- a/src/lib/cooperation/core/gui/mainwindow.cpp
+++ b/src/lib/cooperation/core/gui/mainwindow.cpp
@@ -240,7 +240,7 @@ void MainWindow::showCloseDialog()
     if (option == "Exit")
         QApplication::quit();
 
-    CooperationDialog dlg;
+    CooperationDialog dlg(this);
 
     QVBoxLayout *layout = new QVBoxLayout();
     QCheckBox *op1 = new QCheckBox(tr("Minimise to system tray"));
@@ -284,6 +284,12 @@ void MainWindow::showCloseDialog()
     dlg.setFixedSize(400, 200);
 #endif
 
+    // get the center position of parent window and move to center
+    QRect parentRect = this->window()->frameGeometry();
+    QRect dialogRect = dlg.frameGeometry();
+    QPoint centerPoint = parentRect.center() - dialogRect.center();
+    dlg.move(centerPoint);
+
     int code = dlg.exec();
     if (code == QDialog::Accepted) {
         bool isExit = op2->checkState() == Qt::Checked;