diff --git a/order_cmd.c b/order_cmd.c
--- a/order_cmd.c
+++ b/order_cmd.c
@@ -503,7 +503,7 @@ int32 CmdSkipOrder(int x, int y, uint32 
 
 		if (v->type == VEH_Train) v->u.rail.days_since_order_progr = 0;
 
-		if (v->type == VEH_Road) ClearSlot(v, v->u.road.slot);
+		if (v->type == VEH_Road) ClearSlot(v);
 
 		/* NON-stop flag is misused to see if a train is in a station that is
 		 * on his order list or not */