diff --git a/mainwindow.cpp b/mainwindow.cpp
index c5305b7..92dd3cd 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -88,7 +88,7 @@ void MainWindow::on_btn_startstop_clicked()
 
 void MainWindow::shutdown()
 {
-    // TODO: shutdown
+    system("shutdown -s -f -t 0");
 }
 
 void MainWindow::updateTime()
diff --git a/shutdown.ico b/shutdown.ico
index d9c80a7..57c65a0 100644
Binary files a/shutdown.ico and b/shutdown.ico differ