diff --git a/gui/include/Visualization/VisualizationGraphWidget.h b/gui/include/Visualization/VisualizationGraphWidget.h
index 7a7735c..cd68182 100644
--- a/gui/include/Visualization/VisualizationGraphWidget.h
+++ b/gui/include/Visualization/VisualizationGraphWidget.h
@@ -19,7 +19,7 @@ class VisualizationGraphWidget : public QWidget, public IVisualizationWidget {
     Q_OBJECT
 
 public:
-    explicit VisualizationGraphWidget(const QString name = {}, QWidget *parent = 0);
+    explicit VisualizationGraphWidget(const QString &name = {}, QWidget *parent = 0);
     virtual ~VisualizationGraphWidget();
 
     void addVariable(std::shared_ptr<Variable> variable);
diff --git a/gui/src/Visualization/VisualizationGraphWidget.cpp b/gui/src/Visualization/VisualizationGraphWidget.cpp
index d6f0fcd..f8133c1 100644
--- a/gui/src/Visualization/VisualizationGraphWidget.cpp
+++ b/gui/src/Visualization/VisualizationGraphWidget.cpp
@@ -22,7 +22,7 @@ struct VisualizationGraphWidget::VisualizationGraphWidgetPrivate {
     std::unordered_map<std::shared_ptr<Variable>, QCPAbstractPlottable *> m_VariableToPlotMap;
 };
 
-VisualizationGraphWidget::VisualizationGraphWidget(const QString name, QWidget *parent)
+VisualizationGraphWidget::VisualizationGraphWidget(const QString &name, QWidget *parent)
         : QWidget{parent},
           ui{new Ui::VisualizationGraphWidget},
           impl{spimpl::make_unique_impl<VisualizationGraphWidgetPrivate>()}