diff --git a/src/arch/LoadingWindow/LoadingWindow_Null.h b/src/arch/LoadingWindow/LoadingWindow_Null.h
index 4b470f80b2..6d8f48b664 100644
--- a/src/arch/LoadingWindow/LoadingWindow_Null.h
+++ b/src/arch/LoadingWindow/LoadingWindow_Null.h
@@ -7,7 +7,7 @@ class LoadingWindow_Null: public LoadingWindow
 {
 public:
 	void SetText( RString str ) { }
-	void SetSplash( RString str ) { }
+	void SetSplash( const RString str ) { }
 };
 #define USE_LOADING_WINDOW_NULL