diff --git a/src/newgrf_engine.cpp b/src/newgrf_engine.cpp
--- a/src/newgrf_engine.cpp
+++ b/src/newgrf_engine.cpp
@@ -655,7 +655,7 @@ static uint32 VehicleGetVariable(const R
 		case 0x05: return GB(v->index, 8, 8);
 		case 0x0A: return v->current_order.Pack();
 		case 0x0B: return GB(v->current_order.Pack(), 8, 8);
-		case 0x0C: return v->num_orders;
+		case 0x0C: return v->GetNumOrders();
 		case 0x0D: return v->cur_order_index;
 		case 0x10: return v->load_unload_time_rem;
 		case 0x11: return GB(v->load_unload_time_rem, 8, 8);