diff --git a/autotests/kmainwindow_unittest.h b/autotests/kmainwindow_unittest.h
--- a/autotests/kmainwindow_unittest.h
+++ b/autotests/kmainwindow_unittest.h
@@ -37,6 +37,7 @@
     void testAutoSaveSettings();
     void testNoAutoSave();
     void testWidgetWithStatusBar();
+    void testNativeWidgetSaveSettings();
 
     void testDeleteOnClose();
 };
diff --git a/autotests/kmainwindow_unittest.cpp b/autotests/kmainwindow_unittest.cpp
--- a/autotests/kmainwindow_unittest.cpp
+++ b/autotests/kmainwindow_unittest.cpp
@@ -26,6 +26,7 @@
 #include <ktoolbar.h>
 #include <ksharedconfig.h>
 #include <kconfiggroup.h>
+#include <QDockWidget>
 
 QTEST_MAIN(KMainWindow_UnitTest)
 
@@ -226,3 +227,70 @@
     QStatusBar *frameStatusBar = new QStatusBar(frame1);
     QVERIFY(mw.statusBar() != frameStatusBar);
 }
+
+
+class NativeMainWindow : public KMainWindow
+{
+public:
+    NativeMainWindow() : KMainWindow()
+    {
+        m_dock = new QDockWidget(QStringLiteral("dock"), this);
+        m_dock->setObjectName(QStringLiteral("dock"));
+        m_dock->setAllowedAreas(Qt::AllDockWidgetAreas);
+        m_dock->setFeatures(QDockWidget::DockWidgetMovable);
+        m_dock->setFloating(false);
+
+        QWidget *w = new QWidget(m_dock);
+
+        m_dock->setWidget(w);
+        addDockWidget(Qt::RightDockWidgetArea, m_dock);
+
+        setCentralWidget(new QWidget(this));
+
+        show();
+
+        setAutoSaveSettings(QStringLiteral("NativeWidgetTestGroup"));
+
+        w->setAttribute(Qt::WA_NativeWindow);
+    }
+
+    QDockWidget *m_dock;
+};
+
+void KMainWindow_UnitTest::testNativeWidgetSaveSettings()
+{
+    {
+        QEventLoop el;
+        NativeMainWindow *mw = new NativeMainWindow();
+        connect(mw, &QObject::destroyed, &el, &QEventLoop::quit); // quit event loop when window's gone
+
+        QApplication::postEvent(mw, new QDeferredDeleteEvent);
+
+        el.exec();
+    }
+
+    {
+        QEventLoop el;
+        NativeMainWindow *mw = new NativeMainWindow();
+        connect(mw, &QObject::destroyed, &el, &QEventLoop::quit);
+
+        QCOMPARE(mw->m_dock->isHidden(), false);
+        mw->m_dock->hide();
+
+        QApplication::postEvent(mw, new QDeferredDeleteEvent);
+
+        el.exec();
+    }
+
+    {
+        QEventLoop el;
+        NativeMainWindow *mw = new NativeMainWindow();
+        connect(mw, &QObject::destroyed, &el, &QEventLoop::quit);
+
+        QVERIFY(mw->m_dock->isHidden());
+
+        QApplication::postEvent(mw, new QDeferredDeleteEvent);
+
+        el.exec();
+    }
+}