diff --git a/examples/uitools/multipleinheritance/calculatorform.cpp b/examples/uitools/multipleinheritance/calculatorform.cpp
index 041c78e45101f2474711a2794777c5187ebf4b56..73bbd4fe5f4790a7b16ea27c2dc44ded11056642 100644
--- a/examples/uitools/multipleinheritance/calculatorform.cpp
+++ b/examples/uitools/multipleinheritance/calculatorform.cpp
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -48,8 +48,8 @@
 **
 ****************************************************************************/
 
-#include <QtWidgets>
 #include "calculatorform.h"
+#include <QWidget>
 
 
 //! [0]
diff --git a/examples/uitools/multipleinheritance/calculatorform.h b/examples/uitools/multipleinheritance/calculatorform.h
index cb40e49188e970072664a97c85596af771c5ae5c..28a885c82ea4710675874a00404bfa02e3d4a414 100644
--- a/examples/uitools/multipleinheritance/calculatorform.h
+++ b/examples/uitools/multipleinheritance/calculatorform.h
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
@@ -61,7 +61,7 @@ class CalculatorForm : public QWidget, private Ui::CalculatorForm
     Q_OBJECT
 
 public:
-    CalculatorForm(QWidget *parent = 0);
+    explicit CalculatorForm(QWidget *parent = nullptr);
 
 private slots:
     void on_inputSpinBox1_valueChanged(int value);
diff --git a/examples/uitools/multipleinheritance/main.cpp b/examples/uitools/multipleinheritance/main.cpp
index 9e85ae479a4b992b6c547f38ed35f863e7cf3297..4a6c600c8d7add874f3e545fa01603b988680d02 100644
--- a/examples/uitools/multipleinheritance/main.cpp
+++ b/examples/uitools/multipleinheritance/main.cpp
@@ -48,8 +48,8 @@
 **
 ****************************************************************************/
 
-#include <QApplication>
 #include "calculatorform.h"
+#include <QApplication>
 
 //! [0]
 int main(int argc, char *argv[])
diff --git a/examples/uitools/multipleinheritance/multipleinheritance.pro b/examples/uitools/multipleinheritance/multipleinheritance.pro
index 1baace29c8a02c2bd27cc9634a38da588797c2d4..fd40982ed64e7a1eb6eacd57f148553844b5314f 100644
--- a/examples/uitools/multipleinheritance/multipleinheritance.pro
+++ b/examples/uitools/multipleinheritance/multipleinheritance.pro
@@ -1,10 +1,11 @@
 #! [0]
-SOURCES = calculatorform.cpp main.cpp
+QT += widgets
+
 HEADERS = calculatorform.h
+SOURCES = calculatorform.cpp main.cpp
 FORMS = calculatorform.ui
 #! [0]
 
 target.path = $$[QT_INSTALL_EXAMPLES]/uitools/multipleinheritance
 INSTALLS += target
 
-QT += widgets