diff --git a/src/lib/gui/dialogs/AddClientDialog.h b/src/lib/gui/dialogs/AddClientDialog.h
index 678706a9e..f9b9f8d14 100644
--- a/src/lib/gui/dialogs/AddClientDialog.h
+++ b/src/lib/gui/dialogs/AddClientDialog.h
@@ -29,7 +29,7 @@ class AddClientDialog : public QDialog
 {
   Q_OBJECT
 public:
-  AddClientDialog(const QString &clientName, QWidget *parent = 0);
+  AddClientDialog(const QString &clientName, QWidget *parent = nullptr);
   ~AddClientDialog() override;
 
   int addResult()