diff --git a/src/plugins/platforms/xcb/gl_integrations/qxcbglintegration.h b/src/plugins/platforms/xcb/gl_integrations/qxcbglintegration.h
index 8e2b3aed224..fb77a38860c 100644
--- a/src/plugins/platforms/xcb/gl_integrations/qxcbglintegration.h
+++ b/src/plugins/platforms/xcb/gl_integrations/qxcbglintegration.h
@@ -1,7 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBGLINTEGRATION_H
+#pragma once
 
 #include "qxcbexport.h"
 #include "qxcbwindow.h"
@@ -37,5 +37,3 @@ public:
 };
 
 QT_END_NAMESPACE
-
-#endif //QXCBGLINTEGRATION_H
diff --git a/src/plugins/platforms/xcb/gl_integrations/qxcbglintegrationfactory.h b/src/plugins/platforms/xcb/gl_integrations/qxcbglintegrationfactory.h
index bb169aee4a6..021f310ad5a 100644
--- a/src/plugins/platforms/xcb/gl_integrations/qxcbglintegrationfactory.h
+++ b/src/plugins/platforms/xcb/gl_integrations/qxcbglintegrationfactory.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBGLINTEGRATIONFACTORY_H
-#define QXCBGLINTEGRATIONFACTORY_H
+#pragma once
 
 #include <QtCore/qstringlist.h>
 
@@ -17,6 +16,3 @@ public:
 };
 
 QT_END_NAMESPACE
-
-#endif //QXCBGLINTEGRATIONFACTORY_H
-
diff --git a/src/plugins/platforms/xcb/gl_integrations/qxcbglintegrationplugin.h b/src/plugins/platforms/xcb/gl_integrations/qxcbglintegrationplugin.h
index 3de9d3f408c..fb2a930287f 100644
--- a/src/plugins/platforms/xcb/gl_integrations/qxcbglintegrationplugin.h
+++ b/src/plugins/platforms/xcb/gl_integrations/qxcbglintegrationplugin.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBGLINTEGRATIONPLUGIN_H
-#define QXCBGLINTEGRATIONPLUGIN_H
+#pragma once
 
 #include "qxcbexport.h"
 #include <QtCore/qplugin.h>
@@ -28,5 +27,3 @@ public:
     QXcbGlIntegration *create(const QString &) { return create(); }
 };
 QT_END_NAMESPACE
-
-#endif //QXCBGLINTEGRATIONPLUGIN_H
diff --git a/src/plugins/platforms/xcb/gl_integrations/qxcbnativeinterfacehandler.h b/src/plugins/platforms/xcb/gl_integrations/qxcbnativeinterfacehandler.h
index 58c28c85b02..f3e6f489e57 100644
--- a/src/plugins/platforms/xcb/gl_integrations/qxcbnativeinterfacehandler.h
+++ b/src/plugins/platforms/xcb/gl_integrations/qxcbnativeinterfacehandler.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBNATIVEINTERFACEHANDLER_H
-#define QXCBNATIVEINTERFACEHANDLER_H
+#pragma once
 
 #include <QtCore/QByteArray>
 #include <QtGui/qpa/qplatformnativeinterface.h>
@@ -30,5 +29,3 @@ protected:
 };
 
 QT_END_NAMESPACE
-
-#endif //QXCBNATIVEINTERFACEHANDLER_H
diff --git a/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglcontext.h b/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglcontext.h
index 3044493291f..1598da86ab5 100644
--- a/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglcontext.h
+++ b/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglcontext.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBEGLCONTEXT_H
-#define QXCBEGLCONTEXT_H
+#pragma once
 
 #include "qxcbeglwindow.h"
 #include <QtGui/private/qeglplatformcontext_p.h>
@@ -52,5 +51,3 @@ public:
 };
 
 QT_END_NAMESPACE
-#endif //QXCBEGLCONTEXT_H
-
diff --git a/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglinclude.h b/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglinclude.h
index d12501bd90d..cf010e51a25 100644
--- a/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglinclude.h
+++ b/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglinclude.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBINCLUDE_H
-#define QXCBINCLUDE_H
+#pragma once
 
 #include <QtGui/QPalette>
 #include <QtCore/QTextStream>
@@ -14,5 +13,3 @@
 QT_BEGIN_NAMESPACE
 
 QT_END_NAMESPACE
-
-#endif //QXCBINCLUDE_H
diff --git a/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglintegration.h b/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglintegration.h
index 7caf4304bcb..bd60677e9d2 100644
--- a/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglintegration.h
+++ b/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglintegration.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBEGLINTEGRATION_H
-#define QXCBEGLINTEGRATION_H
+#pragma once
 
 #include "qxcbglintegration.h"
 
@@ -51,4 +50,3 @@ private:
 };
 
 QT_END_NAMESPACE
-#endif //QXCBEGLINTEGRATION_H
diff --git a/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglnativeinterfacehandler.h b/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglnativeinterfacehandler.h
index fdd48fc8425..e147f251796 100644
--- a/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglnativeinterfacehandler.h
+++ b/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglnativeinterfacehandler.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBEGLNATIVEINTERFACEHANDLER_H
-#define QXCBEGLNATIVEINTERFACEHANDLER_H
+#pragma once
 
 #include "qxcbnativeinterfacehandler.h"
 
@@ -30,5 +29,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif //QXCBEGLNATIVEINTERFACEHANDLER_H
diff --git a/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglwindow.h b/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglwindow.h
index 935a0c6d43f..d045158b687 100644
--- a/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglwindow.h
+++ b/src/plugins/platforms/xcb/gl_integrations/xcb_egl/qxcbeglwindow.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBEGLWINDOW_H
-#define QXCBEGLWINDOW_H
+#pragma once
 
 #include "qxcbwindow.h"
 
@@ -34,4 +33,3 @@ private:
 };
 
 QT_END_NAMESPACE
-#endif //QXCBEGLWINDOW_H
diff --git a/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qglxintegration.h b/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qglxintegration.h
index f46ae46b31e..8e80733c619 100644
--- a/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qglxintegration.h
+++ b/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qglxintegration.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QGLXINTEGRATION_H
-#define QGLXINTEGRATION_H
+#pragma once
 
 #include "qxcbwindow.h"
 #include "qxcbscreen.h"
@@ -76,5 +75,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qxcbglxintegration.h b/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qxcbglxintegration.h
index 797f6c4b3fe..077af6f2de3 100644
--- a/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qxcbglxintegration.h
+++ b/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qxcbglxintegration.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBGLXINTEGRATION_H
-#define QXCBGLXINTEGRATION_H
+#pragma once
 
 #include "qxcbglintegration.h"
 
@@ -36,5 +35,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif //QXCBGLXINTEGRATION_H
diff --git a/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qxcbglxnativeinterfacehandler.h b/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qxcbglxnativeinterfacehandler.h
index 5ca329a3685..73a7b7b8b5a 100644
--- a/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qxcbglxnativeinterfacehandler.h
+++ b/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qxcbglxnativeinterfacehandler.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBGLXNATIVEINTERFACEHANDLER_H
-#define QXCBGLXNATIVEINTERFACEHANDLER_H
+#pragma once
 
 #include "qxcbnativeinterfacehandler.h"
 
@@ -25,5 +24,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif //QXCBGLXNATIVEINTERFACEHANDLER_H
diff --git a/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qxcbglxwindow.h b/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qxcbglxwindow.h
index 3b39dc1ba08..05902efb883 100644
--- a/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qxcbglxwindow.h
+++ b/src/plugins/platforms/xcb/gl_integrations/xcb_glx/qxcbglxwindow.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBGLXWINDOW_H
-#define QXCBGLXWINDOW_H
+#pragma once
 
 #include "qxcbglxintegration.h"
 #include "qxcbwindow.h"
@@ -20,5 +19,3 @@ protected:
 };
 
 QT_END_NAMESPACE
-
-#endif //QXCBGLXWINDOW_H
diff --git a/src/plugins/platforms/xcb/nativepainting/qbackingstore_x11_p.h b/src/plugins/platforms/xcb/nativepainting/qbackingstore_x11_p.h
index f57a5be9a68..f2851adf23e 100644
--- a/src/plugins/platforms/xcb/nativepainting/qbackingstore_x11_p.h
+++ b/src/plugins/platforms/xcb/nativepainting/qbackingstore_x11_p.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QBACKINGSTORE_X11_H
-#define QBACKINGSTORE_X11_H
+#pragma once
 
 #include <qpa/qplatformbackingstore.h>
 
@@ -36,5 +35,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif // QBACKINGSTORE_X11_H
diff --git a/src/plugins/platforms/xcb/nativepainting/qcolormap_x11_p.h b/src/plugins/platforms/xcb/nativepainting/qcolormap_x11_p.h
index eedf798e008..56955ee7939 100644
--- a/src/plugins/platforms/xcb/nativepainting/qcolormap_x11_p.h
+++ b/src/plugins/platforms/xcb/nativepainting/qcolormap_x11_p.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QCOLORMAP_X11_H
-#define QCOLORMAP_X11_H
+#pragma once
 
 #include <QColor>
 #include <QList>
@@ -41,5 +40,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif // QCOLORMAP_X11_H
diff --git a/src/plugins/platforms/xcb/nativepainting/qpaintengine_x11_p.h b/src/plugins/platforms/xcb/nativepainting/qpaintengine_x11_p.h
index f799fdd900b..ad8ac57d259 100644
--- a/src/plugins/platforms/xcb/nativepainting/qpaintengine_x11_p.h
+++ b/src/plugins/platforms/xcb/nativepainting/qpaintengine_x11_p.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QPAINTENGINE_X11_H
-#define QPAINTENGINE_X11_H
+#pragma once
 
 #include <QtGui/QPaintEngine>
 
@@ -84,5 +83,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif // QPAINTENGINE_X11_H
diff --git a/src/plugins/platforms/xcb/nativepainting/qpixmap_x11_p.h b/src/plugins/platforms/xcb/nativepainting/qpixmap_x11_p.h
index 7d830baaa7d..b7a633f5b8e 100644
--- a/src/plugins/platforms/xcb/nativepainting/qpixmap_x11_p.h
+++ b/src/plugins/platforms/xcb/nativepainting/qpixmap_x11_p.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QX11PLATFORMPIXMAP_H
-#define QX11PLATFORMPIXMAP_H
+#pragma once
 
 #include <QBitmap>
 #include <QPixmap>
@@ -129,5 +128,3 @@ int qt_x11SetDefaultScreen(int screen);
 void qt_x11SetScreen(QPixmap &pixmap, int screen);
 
 QT_END_NAMESPACE
-
-#endif // QX11PLATFORMPIXMAP_H
diff --git a/src/plugins/platforms/xcb/nativepainting/qpolygonclipper_p.h b/src/plugins/platforms/xcb/nativepainting/qpolygonclipper_p.h
index e640fc11a0c..fb0e0dd34cf 100644
--- a/src/plugins/platforms/xcb/nativepainting/qpolygonclipper_p.h
+++ b/src/plugins/platforms/xcb/nativepainting/qpolygonclipper_p.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QPOLYGONCLIPPER_P_H
-#define QPOLYGONCLIPPER_P_H
+#pragma once
 
 //
 //  W A R N I N G
@@ -276,5 +275,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif // QPOLYGONCLIPPER_P_H
diff --git a/src/plugins/platforms/xcb/nativepainting/qt_x11_p.h b/src/plugins/platforms/xcb/nativepainting/qt_x11_p.h
index 66e0aa2cf85..4307429d2cd 100644
--- a/src/plugins/platforms/xcb/nativepainting/qt_x11_p.h
+++ b/src/plugins/platforms/xcb/nativepainting/qt_x11_p.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QT_X11_P_H
-#define QT_X11_P_H
+#pragma once
 
 #define register        /* C++17 deprecated register */
 #include <X11/Xlib.h>
@@ -161,5 +160,3 @@ constexpr inline int lowest_bit(T v) noexcept
 }
 
 QT_END_NAMESPACE
-
-#endif // QT_X11_P_H
diff --git a/src/plugins/platforms/xcb/nativepainting/qtessellator_p.h b/src/plugins/platforms/xcb/nativepainting/qtessellator_p.h
index 70379c9e554..9b64f6fdea8 100644
--- a/src/plugins/platforms/xcb/nativepainting/qtessellator_p.h
+++ b/src/plugins/platforms/xcb/nativepainting/qtessellator_p.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QTESSELATOR_P_H
-#define QTESSELATOR_P_H
+#pragma once
 
 #include <QPoint>
 #include <QRect>
@@ -49,5 +48,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/nativepainting/qxcbnativepainting.h b/src/plugins/platforms/xcb/nativepainting/qxcbnativepainting.h
index 5ee42986459..58d9b99ed38 100644
--- a/src/plugins/platforms/xcb/nativepainting/qxcbnativepainting.h
+++ b/src/plugins/platforms/xcb/nativepainting/qxcbnativepainting.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBNATIVEPAINTING_H
-#define QXCBNATIVEPAINTING_H
+#pragma once
 
 #include <QSharedDataPointer>
 #include "qt_x11_p.h"
@@ -62,5 +61,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif // QXCBNATIVEPAINTING_H
diff --git a/src/plugins/platforms/xcb/qt_xlib_wrapper.h b/src/plugins/platforms/xcb/qt_xlib_wrapper.h
index 642dbdeadd3..0439adb609c 100644
--- a/src/plugins/platforms/xcb/qt_xlib_wrapper.h
+++ b/src/plugins/platforms/xcb/qt_xlib_wrapper.h
@@ -1,7 +1,6 @@
 // Copyright (C) 2022 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
-#ifndef QT_XLIB_WRAPPER_H
-#define QT_XLIB_WRAPPER_H
+#pragma once
 
 #ifdef __cplusplus
 extern "C" {
@@ -13,5 +12,3 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
-
-#endif // QT_XLIB_WRAPPER_H
diff --git a/src/plugins/platforms/xcb/qxcbatom.h b/src/plugins/platforms/xcb/qxcbatom.h
index 7dd52f122c7..eccb0dc62ce 100644
--- a/src/plugins/platforms/xcb/qxcbatom.h
+++ b/src/plugins/platforms/xcb/qxcbatom.h
@@ -1,7 +1,6 @@
 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
-#ifndef QXCBATOM_H
-#define QXCBATOM_H
+#pragma once
 
 #include <xcb/xcb.h>
 
@@ -230,5 +229,3 @@ protected:
 private:
     xcb_atom_t m_allAtoms[QXcbAtom::NAtoms];
 };
-
-#endif // QXCBATOM_H
diff --git a/src/plugins/platforms/xcb/qxcbbackingstore.h b/src/plugins/platforms/xcb/qxcbbackingstore.h
index 979b2543267..674640780eb 100644
--- a/src/plugins/platforms/xcb/qxcbbackingstore.h
+++ b/src/plugins/platforms/xcb/qxcbbackingstore.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBBACKINGSTORE_H
-#define QXCBBACKINGSTORE_H
+#pragma once
 
 #include <qpa/qplatformbackingstore.h>
 #include <QtCore/QStack>
@@ -77,5 +76,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/qxcbclipboard.h b/src/plugins/platforms/xcb/qxcbclipboard.h
index 4538481f1cc..36eff4d8dfc 100644
--- a/src/plugins/platforms/xcb/qxcbclipboard.h
+++ b/src/plugins/platforms/xcb/qxcbclipboard.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBCLIPBOARD_H
-#define QXCBCLIPBOARD_H
+#pragma once
 
 #include <qpa/qplatformclipboard.h>
 #include <qxcbobject.h>
@@ -110,5 +109,3 @@ private:
 #endif // QT_NO_CLIPBOARD
 
 QT_END_NAMESPACE
-
-#endif // QXCBCLIPBOARD_H
diff --git a/src/plugins/platforms/xcb/qxcbconnection.h b/src/plugins/platforms/xcb/qxcbconnection.h
index b99a48cdc55..41cf7d4b35b 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.h
+++ b/src/plugins/platforms/xcb/qxcbconnection.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBCONNECTION_H
-#define QXCBCONNECTION_H
+#pragma once
 
 #include <xcb/xcb.h>
 #include <xcb/randr.h>
@@ -376,5 +375,3 @@ template <typename T>
 struct alignas(32) q_padded_xcb_event : T { };
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/qxcbconnection_basic.h b/src/plugins/platforms/xcb/qxcbconnection_basic.h
index 586b45e8a7c..b66bb384c82 100644
--- a/src/plugins/platforms/xcb/qxcbconnection_basic.h
+++ b/src/plugins/platforms/xcb/qxcbconnection_basic.h
@@ -1,7 +1,7 @@
 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
-#ifndef QXCBBASICCONNECTION_H
-#define QXCBBASICCONNECTION_H
+
+#pragma once
 
 #include "qxcbatom.h"
 #include "qxcbexport.h"
@@ -137,5 +137,3 @@ struct QStdFreeDeleter {
     )
 
 QT_END_NAMESPACE
-
-#endif // QXCBBASICCONNECTION_H
diff --git a/src/plugins/platforms/xcb/qxcbcursor.h b/src/plugins/platforms/xcb/qxcbcursor.h
index 5ec553119da..d8c78882878 100644
--- a/src/plugins/platforms/xcb/qxcbcursor.h
+++ b/src/plugins/platforms/xcb/qxcbcursor.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2022 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBCURSOR_H
-#define QXCBCURSOR_H
+#pragma once
 
 #include <qpa/qplatformcursor.h>
 #include "qxcbscreen.h"
@@ -103,5 +102,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/qxcbcursorfont.h b/src/plugins/platforms/xcb/qxcbcursorfont.h
index fe74e276919..92108641909 100644
--- a/src/plugins/platforms/xcb/qxcbcursorfont.h
+++ b/src/plugins/platforms/xcb/qxcbcursorfont.h
@@ -3,8 +3,7 @@
 
 // copied from <X11/cursorfont.h>
 
-#ifndef QXCBCURSORFONT_H
-#define QXCBCURSORFONT_H
+#pragma once
 
 #define XC_num_glyphs 154
 #define XC_X_cursor 0
@@ -84,5 +83,3 @@
 #define XC_ur_angle 148
 #define XC_watch 150
 #define XC_xterm 152
-
-#endif /* QXCBCURSORFONT_H */
diff --git a/src/plugins/platforms/xcb/qxcbdrag.h b/src/plugins/platforms/xcb/qxcbdrag.h
index 1e6c6f8a733..784b8050df7 100644
--- a/src/plugins/platforms/xcb/qxcbdrag.h
+++ b/src/plugins/platforms/xcb/qxcbdrag.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBDRAG_H
-#define QXCBDRAG_H
+#pragma once
 
 #include <qpa/qplatformdrag.h>
 #include <private/qsimpledrag_p.h>
@@ -155,5 +154,3 @@ private:
 Q_DECLARE_TYPEINFO(QXcbDrag::Transaction, Q_RELOCATABLE_TYPE);
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/qxcbeventdispatcher.h b/src/plugins/platforms/xcb/qxcbeventdispatcher.h
index 9c7e745ac94..717dd97b3f2 100644
--- a/src/plugins/platforms/xcb/qxcbeventdispatcher.h
+++ b/src/plugins/platforms/xcb/qxcbeventdispatcher.h
@@ -1,7 +1,7 @@
 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
-#ifndef QXCBEVENTDISPATCHER_H
-#define QXCBEVENTDISPATCHER_H
+
+#pragma once
 
 #include <QtCore/QObject>
 #include <QtCore/QEventLoop>
@@ -68,5 +68,3 @@ public:
 };
 
 QT_END_NAMESPACE
-
-#endif // QXCBEVENTDISPATCHER_H
diff --git a/src/plugins/platforms/xcb/qxcbeventqueue.h b/src/plugins/platforms/xcb/qxcbeventqueue.h
index 7d8f6d5417f..7880b9bda8f 100644
--- a/src/plugins/platforms/xcb/qxcbeventqueue.h
+++ b/src/plugins/platforms/xcb/qxcbeventqueue.h
@@ -1,7 +1,7 @@
 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
-#ifndef QXCBEVENTQUEUE_H
-#define QXCBEVENTQUEUE_H
+
+#pragma once
 
 #include <QtCore/QThread>
 #include <QtCore/QHash>
@@ -147,5 +147,3 @@ xcb_generic_event_t *QXcbEventQueue::peek(PeekOption option, Peeker &&peeker)
 }
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/qxcbexport.h b/src/plugins/platforms/xcb/qxcbexport.h
index 1a163415591..e282a1fcffe 100644
--- a/src/plugins/platforms/xcb/qxcbexport.h
+++ b/src/plugins/platforms/xcb/qxcbexport.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBEXPORT_H
-#define QXCBEXPORT_H
+#pragma once
 
 #include <QtCore/qglobal.h>
 
@@ -15,5 +14,3 @@ QT_BEGIN_NAMESPACE
 #  endif
 
 QT_END_NAMESPACE
-#endif //QXCBEXPORT_H
-
diff --git a/src/plugins/platforms/xcb/qxcbimage.h b/src/plugins/platforms/xcb/qxcbimage.h
index c022fae6393..7b5f0f44d95 100644
--- a/src/plugins/platforms/xcb/qxcbimage.h
+++ b/src/plugins/platforms/xcb/qxcbimage.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBIMAGE_H
-#define QXCBIMAGE_H
+#pragma once
 
 #include "qxcbscreen.h"
 #include <QtGui/QImage>
@@ -21,5 +20,3 @@ xcb_cursor_t qt_xcb_createCursorXRender(QXcbScreen *screen, const QImage &image,
                                         const QPoint &spot);
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/qxcbintegration.h b/src/plugins/platforms/xcb/qxcbintegration.h
index a5323496f75..f05afa29b13 100644
--- a/src/plugins/platforms/xcb/qxcbintegration.h
+++ b/src/plugins/platforms/xcb/qxcbintegration.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBINTEGRATION_H
-#define QXCBINTEGRATION_H
+#pragma once
 
 #include <QtGui/private/qtguiglobal_p.h>
 #include <qpa/qplatformintegration.h>
@@ -127,5 +126,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/qxcbkeyboard.h b/src/plugins/platforms/xcb/qxcbkeyboard.h
index 62d9268c64f..9528b8a7e47 100644
--- a/src/plugins/platforms/xcb/qxcbkeyboard.h
+++ b/src/plugins/platforms/xcb/qxcbkeyboard.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBKEYBOARD_H
-#define QXCBKEYBOARD_H
+#pragma once
 
 #include "qxcbobject.h"
 
@@ -105,5 +104,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/qxcbmime.h b/src/plugins/platforms/xcb/qxcbmime.h
index 4c99c39c8b9..2aee718bd9c 100644
--- a/src/plugins/platforms/xcb/qxcbmime.h
+++ b/src/plugins/platforms/xcb/qxcbmime.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBMIME_H
-#define QXCBMIME_H
+#pragma once
 
 #include <QtGui/private/qinternalmimedata_p.h>
 
@@ -30,5 +29,3 @@ public:
 };
 
 QT_END_NAMESPACE
-
-#endif // QXCBMIME_H
diff --git a/src/plugins/platforms/xcb/qxcbnativeinterface.h b/src/plugins/platforms/xcb/qxcbnativeinterface.h
index 62bfb4c634f..45be5c7ef4c 100644
--- a/src/plugins/platforms/xcb/qxcbnativeinterface.h
+++ b/src/plugins/platforms/xcb/qxcbnativeinterface.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBNATIVEINTERFACE_H
-#define QXCBNATIVEINTERFACE_H
+#pragma once
 
 #include <qpa/qplatformnativeinterface.h>
 #include <xcb/xcb.h>
@@ -119,5 +118,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif // QXCBNATIVEINTERFACE_H
diff --git a/src/plugins/platforms/xcb/qxcbobject.h b/src/plugins/platforms/xcb/qxcbobject.h
index 965ec636b71..fe26aef9f14 100644
--- a/src/plugins/platforms/xcb/qxcbobject.h
+++ b/src/plugins/platforms/xcb/qxcbobject.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBOBJECT_H
-#define QXCBOBJECT_H
+#pragma once
 
 #include "qxcbconnection.h"
 
@@ -24,5 +23,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/qxcbscreen.h b/src/plugins/platforms/xcb/qxcbscreen.h
index 49165d3ba40..4fb0171a124 100644
--- a/src/plugins/platforms/xcb/qxcbscreen.h
+++ b/src/plugins/platforms/xcb/qxcbscreen.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBSCREEN_H
-#define QXCBSCREEN_H
+#pragma once
 
 #include <qpa/qplatformscreen.h>
 #include <qpa/qplatformscreen_p.h>
@@ -228,5 +227,3 @@ Q_GUI_EXPORT QDebug operator<<(QDebug, const QXcbScreen *);
 #endif
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/qxcbscrollingdevice_p.h b/src/plugins/platforms/xcb/qxcbscrollingdevice_p.h
index 3ee0c06a862..044cd40358d 100644
--- a/src/plugins/platforms/xcb/qxcbscrollingdevice_p.h
+++ b/src/plugins/platforms/xcb/qxcbscrollingdevice_p.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2020 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBSCROLLINGDEVICE_P_H
-#define QXCBSCROLLINGDEVICE_P_H
+#pragma once
 
 #include <QtGui/private/qpointingdevice_p.h>
 
@@ -52,5 +51,3 @@ public:
 };
 
 QT_END_NAMESPACE
-
-#endif // QXCBSCROLLINGDEVICE_P_H
diff --git a/src/plugins/platforms/xcb/qxcbsessionmanager.h b/src/plugins/platforms/xcb/qxcbsessionmanager.h
index 10759319d2c..553ebb271b0 100644
--- a/src/plugins/platforms/xcb/qxcbsessionmanager.h
+++ b/src/plugins/platforms/xcb/qxcbsessionmanager.h
@@ -2,8 +2,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBSESSIONMANAGER_H
-#define QXCBSESSIONMANAGER_H
+#pragma once
 
 //
 //  W A R N I N G
@@ -54,5 +53,3 @@ private:
 QT_END_NAMESPACE
 
 #endif //QT_NO_SESSIONMANAGER
-
-#endif //QXCBSESSIONMANAGER_H
diff --git a/src/plugins/platforms/xcb/qxcbsystemtraytracker.h b/src/plugins/platforms/xcb/qxcbsystemtraytracker.h
index 5c054626b6c..c2e58e6e225 100644
--- a/src/plugins/platforms/xcb/qxcbsystemtraytracker.h
+++ b/src/plugins/platforms/xcb/qxcbsystemtraytracker.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBSYSTEMTRAYTRACKER_H
-#define QXCBSYSTEMTRAYTRACKER_H
+#pragma once
 
 #include "qxcbconnection.h"
 
@@ -45,5 +44,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif // QXCBSYSTEMTRAYTRACKER_H
diff --git a/src/plugins/platforms/xcb/qxcbvulkaninstance.h b/src/plugins/platforms/xcb/qxcbvulkaninstance.h
index 445cd706ae0..24544f61a1f 100644
--- a/src/plugins/platforms/xcb/qxcbvulkaninstance.h
+++ b/src/plugins/platforms/xcb/qxcbvulkaninstance.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2017 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBVULKANINSTANCE_H
-#define QXCBVULKANINSTANCE_H
+#pragma once
 
 #if defined(VULKAN_H_) && !defined(VK_USE_PLATFORM_XCB_KHR)
 #error "vulkan.h included without xcb WSI"
@@ -36,5 +35,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif // QXCBVULKANINSTANCE_H
diff --git a/src/plugins/platforms/xcb/qxcbvulkanwindow.h b/src/plugins/platforms/xcb/qxcbvulkanwindow.h
index 377acd2e8c5..88fbab03867 100644
--- a/src/plugins/platforms/xcb/qxcbvulkanwindow.h
+++ b/src/plugins/platforms/xcb/qxcbvulkanwindow.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2017 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBVULKANWINDOW_H
-#define QXCBVULKANWINDOW_H
+#pragma once
 
 #include "qxcbwindow.h"
 #include "qxcbvulkaninstance.h"
@@ -25,5 +24,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif // QXCBVULKANWINDOW_H
diff --git a/src/plugins/platforms/xcb/qxcbwindow.h b/src/plugins/platforms/xcb/qxcbwindow.h
index 795c5aad8b9..e7f8a5e66ca 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.h
+++ b/src/plugins/platforms/xcb/qxcbwindow.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBWINDOW_H
-#define QXCBWINDOW_H
+#pragma once
 
 #include <qpa/qplatformwindow.h>
 #include <qpa/qplatformwindow_p.h>
@@ -281,5 +280,3 @@ QList<xcb_rectangle_t> qRegionToXcbRectangleList(const QRegion &region);
 QT_END_NAMESPACE
 
 Q_DECLARE_METATYPE(QXcbWindow*)
-
-#endif
diff --git a/src/plugins/platforms/xcb/qxcbwmsupport.h b/src/plugins/platforms/xcb/qxcbwmsupport.h
index 77ad55c4027..f448d2daeca 100644
--- a/src/plugins/platforms/xcb/qxcbwmsupport.h
+++ b/src/plugins/platforms/xcb/qxcbwmsupport.h
@@ -1,7 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
-#ifndef QXCBWMSUPPORT_H
-#define QXCBWMSUPPORT_H
+
+#pragma once
 
 #include "qxcbobject.h"
 #include "qxcbconnection.h"
@@ -28,5 +28,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/xcb/qxcbxsettings.h b/src/plugins/platforms/xcb/qxcbxsettings.h
index efcaae8a20d..e8a75e3556b 100644
--- a/src/plugins/platforms/xcb/qxcbxsettings.h
+++ b/src/plugins/platforms/xcb/qxcbxsettings.h
@@ -1,8 +1,7 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifndef QXCBXSETTINGS_H
-#define QXCBXSETTINGS_H
+#pragma once
 
 #include "qxcbscreen.h"
 
@@ -31,5 +30,3 @@ private:
 };
 
 QT_END_NAMESPACE
-
-#endif // QXCBXSETTINGS_H