diff --git a/src/plugins/platforms/kms/qkmswindow.cpp b/src/plugins/platforms/kms/qkmswindow.cpp
index 691d9a832c1..f016d9d6214 100644
--- a/src/plugins/platforms/kms/qkmswindow.cpp
+++ b/src/plugins/platforms/kms/qkmswindow.cpp
@@ -43,22 +43,25 @@
 #include "qkmsscreen.h"
 
 #include <qpa/qwindowsysteminterface.h>
+#include <qpa/qplatformwindow_p.h>
+
 QT_BEGIN_NAMESPACE
 
 QKmsWindow::QKmsWindow(QWindow *window)
     : QPlatformWindow(window)
 {
+    Q_D(QPlatformWindow);
     m_screen = QPlatformScreen::platformScreenForWindow(window);
-
     static_cast<QKmsScreen *>(m_screen)->initializeWithFormat(window->requestedFormat());
+    setGeometry(d->rect); // rect is set to window->geometry() in base ctor
 }
 
 void QKmsWindow::setGeometry(const QRect &rect)
 {
-    Q_UNUSED(rect)
-    //All Windows must be fullscreen
+    // All windows must be fullscreen
     QRect fullscreenRect = m_screen->availableGeometry();
-    QWindowSystemInterface::handleGeometryChange(window(), fullscreenRect);
+    if (rect != fullscreenRect)
+        QWindowSystemInterface::handleGeometryChange(window(), fullscreenRect);
 
     QPlatformWindow::setGeometry(fullscreenRect);
 }
diff --git a/src/plugins/platforms/kms/qkmswindow.h b/src/plugins/platforms/kms/qkmswindow.h
index c9b3c2692fa..ba76b2beac8 100644
--- a/src/plugins/platforms/kms/qkmswindow.h
+++ b/src/plugins/platforms/kms/qkmswindow.h
@@ -48,6 +48,8 @@ QT_BEGIN_NAMESPACE
 
 class QKmsWindow : public QPlatformWindow
 {
+    Q_DECLARE_PRIVATE(QPlatformWindow)
+
 public:
     QKmsWindow(QWindow *window);