Aircon extension cord help

So I rent an old house and the outlet that my aircon is plugged into stopped working. There’s a plug about a meter away on the floor that’s newer and still works, and I can theoretically plug it in there, but the cord, of course, isn’t long enough. Is there a specific extension cord I can use that’s safe? I know the big ticket appliances aren’t recommend to use with extension cords because fire but surely there’s something.