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-rw-r--r--roadveh_cmd.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/roadveh_cmd.c b/roadveh_cmd.c
index c9d1176f8..963f635ec 100644
--- a/roadveh_cmd.c
+++ b/roadveh_cmd.c
@@ -103,7 +103,7 @@ static int32 EstimateRoadVehCost(EngineID engine_type)
/** Build a road vehicle.
* @param tile tile of depot where road vehicle is built
* @param p1 bus/truck type being built (engine)
- * @param p2 unused
+ * @param p2 bit 0 when set, the unitnumber will be 0, otherwise it will be a free number
*/
int32 CmdBuildRoadVeh(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
{
@@ -129,7 +129,7 @@ int32 CmdBuildRoadVeh(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
return_cmd_error(STR_00E1_TOO_MANY_VEHICLES_IN_GAME);
/* find the first free roadveh id */
- unit_num = GetFreeUnitNumber(VEH_Road);
+ unit_num = (HASBIT(p2, 0) == true) ? 0 : GetFreeUnitNumber(VEH_Road);
if (unit_num > _patches.max_roadveh)
return_cmd_error(STR_00E1_TOO_MANY_VEHICLES_IN_GAME);