diff --git a/src/widgets/kernel/qlayout.cpp b/src/widgets/kernel/qlayout.cpp
index 8ea93f7d4e..755dce1a8c 100644
--- a/src/widgets/kernel/qlayout.cpp
+++ b/src/widgets/kernel/qlayout.cpp
@@ -586,15 +586,15 @@ static bool removeWidgetRecursively(QLayoutItem *li, QObject *w)
 void QLayoutPrivate::doResize(const QSize &r)
 {
     Q_Q(QLayout);
-    int mbh = menuBarHeightForWidth(menubar, r.width());
     QWidget *mw = q->parentWidget();
     QRect rect = mw->testAttribute(Qt::WA_LayoutOnEntireRect) ? mw->rect() : mw->contentsRect();
+    const int mbh = menuBarHeightForWidth(menubar, rect.width());
     const int mbTop = rect.top();
     rect.setTop(mbTop + mbh);
     q->setGeometry(rect);
 #if QT_CONFIG(menubar)
     if (menubar)
-        menubar->setGeometry(rect.left(), mbTop, r.width(), mbh);
+        menubar->setGeometry(rect.left(), mbTop, rect.width(), mbh);
 #endif
 }