diff --git a/QtScrcpy/dialog.cpp b/QtScrcpy/dialog.cpp
index a8ac0a7..3a716f5 100644
--- a/QtScrcpy/dialog.cpp
+++ b/QtScrcpy/dialog.cpp
@@ -85,7 +85,7 @@ Dialog::~Dialog()
 void Dialog::initUI()
 {
     setAttribute(Qt::WA_DeleteOnClose);
-    setWindowFlags(windowFlags() | Qt::WindowMinimizeButtonHint);
+    setWindowFlags(windowFlags() | Qt::WindowMinimizeButtonHint | Qt::WindowCloseButtonHint | Qt::CustomizeWindowHint);
 
     ui->bitRateBox->addItem("2000000");
     ui->bitRateBox->addItem("6000000");