diff --git a/GUI/Models/SessionItem.h b/GUI/Models/SessionItem.h
index dd01e885c216e32a566c3732080531fda1c6170e..a1827d701ec71d5f38b15abfb00dd238d672ec24 100644
--- a/GUI/Models/SessionItem.h
+++ b/GUI/Models/SessionItem.h
@@ -205,7 +205,7 @@ class BA_CORE_API_ SessionItem {
 public:
     static const QString P_NAME;
 
-    explicit SessionItem(const QString& modelType = "");
+    explicit SessionItem(const QString& modelType);
     virtual ~SessionItem();
     SessionModel* model() const;
     SessionItem* parent() const;