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-rw-r--r--vehicle.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/vehicle.c b/vehicle.c
index 0424b4768..5c8a275de 100644
--- a/vehicle.c
+++ b/vehicle.c
@@ -129,7 +129,7 @@ static void *EnsureNoVehicleProcZ(Vehicle *v, void *data)
const TileInfo *ti = data;
if (v->tile != ti->tile || v->type == VEH_Disaster) return NULL;
- if (!IS_INT_INSIDE(ti->z - v->z_pos, 0, 8)) return NULL;
+ if (!IS_INT_INSIDE(ti->z - v->z_pos, 0, 8 + 1)) return NULL;
VehicleInTheWayErrMsg(v);
return v;