diff --git a/src/engine_gui.cpp b/src/engine_gui.cpp
--- a/src/engine_gui.cpp
+++ b/src/engine_gui.cpp
@@ -78,7 +78,7 @@ struct EnginePreviewWindow : Window {
 		this->flags |= WF_STICKY;
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
+	void UpdateWidgetSize(WidgetID widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_EP_QUESTION) return;
 
@@ -105,7 +105,7 @@ struct EnginePreviewWindow : Window {
 		size->height += GetStringHeight(GetEngineInfoString(engine), size->width);
 	}
 
-	void DrawWidget(const Rect &r, int widget) const override
+	void DrawWidget(const Rect &r, WidgetID widget) const override
 	{
 		if (widget != WID_EP_QUESTION) return;
 
@@ -123,7 +123,7 @@ struct EnginePreviewWindow : Window {
 		DrawStringMultiLine(r.left, r.right, y, r.bottom, GetEngineInfoString(engine), TC_FROMSTRING, SA_CENTER);
 	}
 
-	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
+	void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_EP_YES: