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-rw-r--r--src/roadveh_cmd.cpp4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/roadveh_cmd.cpp b/src/roadveh_cmd.cpp
index 21bfb7df5..0da65c5cb 100644
--- a/src/roadveh_cmd.cpp
+++ b/src/roadveh_cmd.cpp
@@ -170,7 +170,7 @@ void RoadVehUpdateCache(Vehicle *v)
* @param tile tile of depot where road vehicle is built
* @param flags operation to perform
* @param p1 bus/truck type being built (engine)
- * @param p2 bit 0 when set, the unitnumber will be 0, otherwise it will be a free number
+ * @param p2 unused
*/
CommandCost CmdBuildRoadVeh(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
{
@@ -204,7 +204,7 @@ CommandCost CmdBuildRoadVeh(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
v = vl[0];
/* find the first free roadveh id */
- unit_num = HasBit(p2, 0) ? 0 : GetFreeUnitNumber(VEH_ROAD);
+ unit_num = (flags & DC_AUTOREPLACE) ? 0 : GetFreeUnitNumber(VEH_ROAD);
if (unit_num > _settings_game.vehicle.max_roadveh)
return_cmd_error(STR_00E1_TOO_MANY_VEHICLES_IN_GAME);