diff --git a/src/setting_defines.h b/src/setting_defines.h
--- a/src/setting_defines.h
+++ b/src/setting_defines.h
@@ -36,6 +36,7 @@ const char SG_MainWindow_Pos[] = "pos";
 const char SG_MainWindow_ActivePanel[] = "activePanel";
 const char SG_MainWindow_HidePanels[] = "hidePanels";
 const char SG_MainWindow_Maximized[] = "maximized";
+const char SG_MainWindow_State[] = "state";
 
 // port setting keys
 const char SG_Port_SelectedPort[] = "selectedPort";