diff --git a/ship_cmd.c b/ship_cmd.c
--- a/ship_cmd.c
+++ b/ship_cmd.c
@@ -901,7 +901,7 @@ int32 CmdBuildShip(TileIndex tile, uint3
 
 		v->service_interval = _patches.servint_ships;
 		v->date_of_last_service = _date;
-		v->build_year = _cur_year;
+		v->build_year = _cur_year - BASE_YEAR;
 		v->cur_image = 0x0E5E;
 		v->type = VEH_Ship;
 		v->random_bits = VehicleRandomBits();