diff --git a/src/plugins/scxmleditor/plugin_interface/historyitem.h b/src/plugins/scxmleditor/plugin_interface/historyitem.h
index ab1ccf3dc4e..91b3679fd51 100644
--- a/src/plugins/scxmleditor/plugin_interface/historyitem.h
+++ b/src/plugins/scxmleditor/plugin_interface/historyitem.h
@@ -53,7 +53,7 @@ protected:
     bool canStartTransition(ItemType type) const override;
 
 private:
-    qreal m_size;
+    qreal m_size = 1.0;
     QPen m_pen;
 };