diff --git a/addons/ui_window/ui_window.gd b/addons/ui_window/ui_window.gd
index cae1cce..925e1dd 100644
--- a/addons/ui_window/ui_window.gd
+++ b/addons/ui_window/ui_window.gd
@@ -421,7 +421,7 @@ func load_from_file( config_file ):
 
 func save_to_file( config_file ):
     
-    var is_open = $VBoxContainer/Content.visible
+    var is_open = content_box.visible
 
     config_file.set_value(self.name, "position", self.rect_position)