diff --git a/src/intro_gui.cpp b/src/intro_gui.cpp
--- a/src/intro_gui.cpp
+++ b/src/intro_gui.cpp
@@ -282,7 +282,7 @@ struct SelectGameWindow : public Window 
 		this->GetWidget<NWidgetStacked>(WID_SGI_TRANSLATION_SELECTION)->SetDisplayedPlane(missing_lang ? 0 : SZSP_NONE);
 	}
 
-	void DrawWidget(const Rect &r, int widget) const override
+	void DrawWidget(const Rect &r, WidgetID widget) const override
 	{
 		switch (widget) {
 			case WID_SGI_BASESET:
@@ -297,7 +297,7 @@ struct SelectGameWindow : public Window 
 		}
 	}
 
-	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
 	{
 		switch (widget) {
 			case WID_SGI_TEMPERATE_LANDSCAPE: case WID_SGI_ARCTIC_LANDSCAPE:
@@ -325,7 +325,7 @@ struct SelectGameWindow : public Window 
 		if (changed) this->ReInit(0, 0, this->flags & WF_CENTERED);
 	}
 
-	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
 	{
 		/* Do not create a network server when you (just) have closed one of the game
 		 * creation/load windows for the network server. */