diff --git a/src/roadveh_cmd.h b/src/roadveh_cmd.h
--- a/src/roadveh_cmd.h
+++ b/src/roadveh_cmd.h
@@ -14,7 +14,7 @@
 #include "engine_type.h"
 #include "vehicle_type.h"
 
-CommandCost CmdBuildRoadVehicle(DoCommandFlag flags, TileIndex tile, const Engine *e, uint16 data, Vehicle **v);
+CommandCost CmdBuildRoadVehicle(DoCommandFlag flags, TileIndex tile, const Engine *e, Vehicle **v);
 
 CommandProc CmdTurnRoadVeh;