diff --git a/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_collection.h b/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_collection.h
index f9a898e6a8a..e8e792915bb 100644
--- a/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_collection.h
+++ b/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_collection.h
@@ -15,9 +15,9 @@ class @COLLECTION_PLUGIN_CLASS@ : public QObject, public QDesignerCustomWidgetCo
     @COLLECTION_PLUGIN_METADATA@
 
 public:
-    explicit @COLLECTION_PLUGIN_CLASS@(QObject *parent = 0);
+    explicit @COLLECTION_PLUGIN_CLASS@(QObject *parent = nullptr);
 
-    virtual QList<QDesignerCustomWidgetInterface*> customWidgets() const;
+    QList<QDesignerCustomWidgetInterface*> customWidgets() const override;
 
 private:
     QList<QDesignerCustomWidgetInterface*> m_widgets;
diff --git a/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_single.cpp b/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_single.cpp
index 06dce7128a9..8afff94d745 100644
--- a/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_single.cpp
+++ b/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_single.cpp
@@ -6,7 +6,6 @@
 @PLUGIN_CLASS@::@PLUGIN_CLASS@(QObject *parent)
     : QObject(parent)
 {
-    m_initialized = false;
 }
 
 void @PLUGIN_CLASS@::initialize(QDesignerFormEditorInterface * /* core */)
diff --git a/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_single.h b/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_single.h
index 0767c0581df..2402458092e 100644
--- a/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_single.h
+++ b/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_single.h
@@ -14,22 +14,22 @@ class @PLUGIN_CLASS@ : public QObject, public QDesignerCustomWidgetInterface
     @SINGLE_PLUGIN_METADATA@
 
 public:
-    @PLUGIN_CLASS@(QObject *parent = 0);
+    explicit @PLUGIN_CLASS@(QObject *parent = nullptr);
 
-    bool isContainer() const;
-    bool isInitialized() const;
-    QIcon icon() const;
-    QString domXml() const;
-    QString group() const;
-    QString includeFile() const;
-    QString name() const;
-    QString toolTip() const;
-    QString whatsThis() const;
-    QWidget *createWidget(QWidget *parent);
-    void initialize(QDesignerFormEditorInterface *core);
+    bool isContainer() const override;
+    bool isInitialized() const override;
+    QIcon icon() const override;
+    QString domXml() const override;
+    QString group() const override;
+    QString includeFile() const override;
+    QString name() const override;
+    QString toolTip() const override;
+    QString whatsThis() const override;
+    QWidget *createWidget(QWidget *parent) override;
+    void initialize(QDesignerFormEditorInterface *core) override;
 
 private:
-    bool m_initialized;
+    bool m_initialized = false;
 };
 
 @if ! '%{Cpp:PragmaOnce}'
diff --git a/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_widget.h b/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_widget.h
index 50256c5ff54..3ec192c6d31 100644
--- a/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_widget.h
+++ b/share/qtcreator/templates/qt4project/customwidgetwizard/tpl_widget.h
@@ -12,7 +12,7 @@ class @WIDGET_CLASS@ : public @WIDGET_BASE_CLASS@
     Q_OBJECT
 
 public:
-    @WIDGET_CLASS@(QWidget *parent = 0);
+    explicit @WIDGET_CLASS@(QWidget *parent = nullptr);
 };
 
 @if ! '%{Cpp:PragmaOnce}'