1 files changed, 1 insertions, 1 deletions
diff --git a/order.h b/order.h
index 57e016afa..94eb7a6c4 100644
--- a/order.h
+++ b/order.h
@@ -141,7 +141,7 @@ static inline Order UnpackOrder(uint32 packed)
 }
 
 /* Functions */
-void BackupVehicleOrders(Vehicle *v, BackuppedOrders *order);
+void BackupVehicleOrders(const Vehicle *v, BackuppedOrders *order);
 void RestoreVehicleOrders(Vehicle *v, BackuppedOrders *order);
 void DeleteDestinationFromVehicleOrder(Order dest);
 void InvalidateVehicleOrder(const Vehicle *v);