1 files changed, 1 insertions, 4 deletions
diff --git a/src/widgets/widgets/qmainwindowlayout.cpp b/src/widgets/widgets/qmainwindowlayout.cpp
index b695918406..ae87ea526d 100644
--- a/src/widgets/widgets/qmainwindowlayout.cpp
+++ b/src/widgets/widgets/qmainwindowlayout.cpp
@@ -375,10 +375,7 @@ void QDockWidgetGroupWindow::adjustFlags()
     Qt::WindowFlags flags = oldFlags;
     if (nativeDeco) {
         flags |= Qt::CustomizeWindowHint | Qt::WindowTitleHint;
-        if (top->features() & QDockWidget::DockWidgetClosable)
-            flags |= Qt::WindowCloseButtonHint;
-        else
-            flags &= ~Qt::WindowCloseButtonHint;
+        flags.setFlag(Qt::WindowCloseButtonHint, top->features() & QDockWidget::DockWidgetClosable);
         flags &= ~Qt::FramelessWindowHint;
     } else {
         flags |= Qt::FramelessWindowHint;