diff --git a/src/textfile_gui.h b/src/textfile_gui.h
--- a/src/textfile_gui.h
+++ b/src/textfile_gui.h
@@ -25,12 +25,12 @@ struct TextfileWindow : public Window, M
 
 	TextfileWindow(TextfileType file_type);
 
-	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override;
-	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override;
-	void DrawWidget(const Rect &r, int widget) const override;
+	void UpdateWidgetSize(WidgetID widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override;
+	void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override;
+	void DrawWidget(const Rect &r, WidgetID widget) const override;
 	void OnResize() override;
 	void OnInvalidateData(int data = 0, bool gui_scope = true) override;
-	void OnDropdownSelect(int widget, int index) override;
+	void OnDropdownSelect(WidgetID widget, int index) override;
 
 	void Reset() override;
 	FontSize DefaultSize() override;