diff --git a/src/qt/qt_mainwindow.cpp b/src/qt/qt_mainwindow.cpp
index 6ea9f9c0f..d63c20668 100644
--- a/src/qt/qt_mainwindow.cpp
+++ b/src/qt/qt_mainwindow.cpp
@@ -270,7 +270,7 @@ MainWindow::MainWindow(QWidget *parent) :
 }
 
 void MainWindow::closeEvent(QCloseEvent *event) {
-    if (confirm_exit)
+    if (confirm_exit && cpu_thread_run)
     {
         QMessageBox questionbox(QMessageBox::Icon::Question, "86Box", "Are you sure you want to exit 86Box?", QMessageBox::Yes | QMessageBox::No, this);
         QCheckBox *chkbox = new QCheckBox("Do not ask me again");
diff --git a/src/qt/qt_platform.cpp b/src/qt/qt_platform.cpp
index 8d30ab5df..9665c3a1b 100644
--- a/src/qt/qt_platform.cpp
+++ b/src/qt/qt_platform.cpp
@@ -16,12 +16,15 @@
 #include <QLibrary>
 #include <QElapsedTimer>
 
+#include "qt_mainwindow.hpp"
+
 #ifdef Q_OS_UNIX
 #include <sys/mman.h>
 #endif
 
 // static QByteArray buf;
 extern QElapsedTimer elapsed_timer;
+extern MainWindow* main_window;
 QElapsedTimer elapsed_timer;
 
 static std::atomic_int blitmx_contention = 0;
@@ -355,6 +358,7 @@ plat_power_off(void)
     cycles -= 99999999;
 
     cpu_thread_run = 0;
+    main_window->close();
 }
 
 void set_language(uint32_t id) {