diff --git a/src/settings_gui.cpp b/src/settings_gui.cpp
--- a/src/settings_gui.cpp
+++ b/src/settings_gui.cpp
@@ -152,7 +152,7 @@ struct BaseSetTextfileWindow : public Te
 		this->LoadTextfile(textfile, BASESET_DIR);
 	}
 
-	/* virtual */ void SetStringParameters(int widget) const
+	void SetStringParameters(int widget) const override
 	{
 		if (widget == WID_TF_CAPTION) {
 			SetDParam(0, content_type);