diff --git a/src/build_vehicle_gui.cpp b/src/build_vehicle_gui.cpp
--- a/src/build_vehicle_gui.cpp
+++ b/src/build_vehicle_gui.cpp
@@ -1529,7 +1529,7 @@ struct BuildVehicleWindow : Window {
 	{
 		switch (widget) {
 			case WID_BV_LIST:
-				DrawEngineList(this->vehicle_type, r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, r.top + WD_FRAMERECT_TOP, &this->eng_list, this->vscroll->GetPosition(), min(this->vscroll->GetPosition() + this->vscroll->GetCapacity(), this->eng_list.size()), this->sel_engine, false, DEFAULT_GROUP);
+				DrawEngineList(this->vehicle_type, r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, r.top + WD_FRAMERECT_TOP, &this->eng_list, this->vscroll->GetPosition(), min(this->vscroll->GetPosition() + this->vscroll->GetCapacity(), (uint)this->eng_list.size()), this->sel_engine, false, DEFAULT_GROUP);
 				break;
 
 			case WID_BV_SORT_ASCENDING_DESCENDING:
@@ -1541,7 +1541,7 @@ struct BuildVehicleWindow : Window {
 	void OnPaint() override
 	{
 		this->GenerateBuildList();
-		this->vscroll->SetCount(this->eng_list.size());
+		this->vscroll->SetCount((uint)this->eng_list.size());
 
 		this->SetWidgetsDisabledState(this->sel_engine == INVALID_ENGINE, WID_BV_SHOW_HIDE, WID_BV_BUILD, WID_BV_RENAME, WIDGET_LIST_END);