--- a/src/date.cpp	Fri Aug 03 19:16:36 2007 +0000
+++ b/src/date.cpp	Fri Aug 03 22:09:42 2007 +0000
@@ -220,7 +220,7 @@
 	for (i = daytick; i < total; i += DAY_TICKS) {
 		Vehicle *v = GetVehicle(i);
 
-		if (IsValidVehicle(v)) _on_new_vehicle_day_proc[v->type](v);
+		if (v->IsValid()) _on_new_vehicle_day_proc[v->type](v);
 	}
 }