diff -r 05ba93066194 -r a7b6f987d269 src/radioGroup.h
--- a/src/radioGroup.h	Sun Sep 06 03:00:28 2015 +0300
+++ b/src/radioGroup.h	Sun Sep 06 03:10:03 2015 +0300
@@ -44,14 +44,14 @@
 		init (Qt::Vertical);
 	}
 
-	explicit RadioGroup (QWidget* parent = null) : QGroupBox (parent)
+	explicit RadioGroup (QWidget* parent = nullptr) : QGroupBox (parent)
 	{
 		init (Qt::Vertical);
 	}
 
-	explicit RadioGroup (const QString& title, QWidget* parent = null);
+	explicit RadioGroup (const QString& title, QWidget* parent = nullptr);
 	explicit RadioGroup (const QString& title, QList<char const*> entries, int const defaultId,
-		const Qt::Orientation orient = Qt::Vertical, QWidget* parent = null);
+		const Qt::Orientation orient = Qt::Vertical, QWidget* parent = nullptr);
 
 	void            addButton	(const char* entry);
 	void            addButton	(QRadioButton* button);