diff --git a/src/widgets/kernel/qwidget_p.h b/src/widgets/kernel/qwidget_p.h
index 99cba0e20f..9586d1a8c9 100644
--- a/src/widgets/kernel/qwidget_p.h
+++ b/src/widgets/kernel/qwidget_p.h
@@ -609,7 +609,7 @@ public:
         }
     }
 
-    void setWSGeometry(bool dontShow=false, const QRect &oldRect = QRect());
+    void setWSGeometry();
 
     inline QPoint mapToWS(const QPoint &p) const
     { return p - data.wrect.topLeft(); }
diff --git a/src/widgets/kernel/qwidget_qpa.cpp b/src/widgets/kernel/qwidget_qpa.cpp
index 5ba0a90d3d..17ed4ca477 100644
--- a/src/widgets/kernel/qwidget_qpa.cpp
+++ b/src/widgets/kernel/qwidget_qpa.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/legal
 **
 ** This file is part of the QtWidgets module of the Qt Toolkit.
@@ -1027,11 +1027,11 @@ void QWidgetPrivate::setWindowOpacity_sys(qreal level)
         q->windowHandle()->setOpacity(level);
 }
 
-void QWidgetPrivate::setWSGeometry(bool dontShow, const QRect &oldRect)
+void QWidgetPrivate::setWSGeometry()
 {
-    Q_UNUSED(dontShow);
-    Q_UNUSED(oldRect);
-    // XXX
+    Q_Q(QWidget);
+    if (QWindow *window = q->windowHandle())
+        window->setGeometry(data.crect);
 }
 
 QPaintEngine *QWidget::paintEngine() const
diff --git a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
index 2a70431223..34936fa5b8 100644
--- a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
+++ b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
@@ -288,6 +288,7 @@ private slots:
 
 #ifndef Q_OS_MAC
     void scroll();
+    void scrollNativeChildren();
 #endif
 
     // tests QWidget::setGeometry()
@@ -4336,7 +4337,30 @@ void tst_QWidget::scroll()
         QTRY_COMPARE(updateWidget.paintedRegion, dirty);
     }
 }
-#endif
+
+// QTBUG-38999, scrolling a widget with native child widgets should move the children.
+void tst_QWidget::scrollNativeChildren()
+{
+    QWidget parent;
+    parent.setWindowTitle(QLatin1String(__FUNCTION__));
+    parent.resize(400, 400);
+    centerOnScreen(&parent);
+    QLabel *nativeLabel = new QLabel(QStringLiteral("nativeLabel"), &parent);
+    const QPoint oldLabelPos(100, 100);
+    nativeLabel->move(oldLabelPos);
+    QVERIFY(nativeLabel->winId());
+    parent.show();
+    QVERIFY(QTest::qWaitForWindowExposed(&parent));
+    const QPoint delta(50, 50);
+    parent.scroll(delta.x(), delta.y());
+    const QPoint newLabelPos = oldLabelPos + delta;
+    QWindow *labelWindow = nativeLabel->windowHandle();
+    QVERIFY(labelWindow);
+    QTRY_COMPARE(labelWindow->geometry().topLeft(), newLabelPos);
+    QTRY_COMPARE(nativeLabel->geometry().topLeft(), newLabelPos);
+}
+
+#endif // Mac OS
 
 class DestroyedSlotChecker : public QObject
 {