diff --git a/examples/corelib/threads/mandelbrot/main.cpp b/examples/corelib/threads/mandelbrot/main.cpp
index 62609abafc5..8aafebf7d75 100644
--- a/examples/corelib/threads/mandelbrot/main.cpp
+++ b/examples/corelib/threads/mandelbrot/main.cpp
@@ -2,15 +2,12 @@
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 #include "mandelbrotwidget.h"
+#include "renderthread.h"
 
 #include <QApplication>
-
-#include <QScreen>
-
 #include <QCommandLineParser>
 #include <QCommandLineOption>
 #include <QDebug>
-#include <QRect>
 
 using namespace Qt::StringLiterals;
 
diff --git a/examples/corelib/threads/mandelbrot/mandelbrotwidget.cpp b/examples/corelib/threads/mandelbrot/mandelbrotwidget.cpp
index 630c63135cc..a42a20c7c64 100644
--- a/examples/corelib/threads/mandelbrot/mandelbrotwidget.cpp
+++ b/examples/corelib/threads/mandelbrot/mandelbrotwidget.cpp
@@ -4,6 +4,7 @@
 #include "mandelbrotwidget.h"
 
 #include <QGesture>
+#include <QGestureEvent>
 #include <QKeyEvent>
 #include <QPainter>
 
diff --git a/examples/corelib/threads/mandelbrot/mandelbrotwidget.h b/examples/corelib/threads/mandelbrot/mandelbrotwidget.h
index 23c3a2bf409..642feebdd83 100644
--- a/examples/corelib/threads/mandelbrot/mandelbrotwidget.h
+++ b/examples/corelib/threads/mandelbrot/mandelbrotwidget.h
@@ -4,11 +4,14 @@
 #ifndef MANDELBROTWIDGET_H
 #define MANDELBROTWIDGET_H
 
-#include <QGestureEvent>
-#include <QPixmap>
-#include <QWidget>
 #include "renderthread.h"
 
+#include <QPixmap>
+#include <QWidget>
+
+QT_BEGIN_NAMESPACE
+class QGestureEvent;
+QT_END_NAMESPACE
 
 //! [0]
 class MandelbrotWidget : public QWidget
diff --git a/examples/corelib/threads/mandelbrot/renderthread.cpp b/examples/corelib/threads/mandelbrot/renderthread.cpp
index 9e6c884f91d..7e4ff5ba8e5 100644
--- a/examples/corelib/threads/mandelbrot/renderthread.cpp
+++ b/examples/corelib/threads/mandelbrot/renderthread.cpp
@@ -4,7 +4,6 @@
 #include "renderthread.h"
 
 #include <QImage>
-
 #include <QElapsedTimer>
 #include <QTextStream>