Using 11mm belt on 12mm pulley

My drive belt broke. Found some cheap 11mm HTD 5M belts on ebay. Would this work on 12mm pulleys or is this just a bad idea?

https://www.ebay.de/i/302885208449?_trksid=p1.c100966.m3622&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20180511110510%26meid%3D0138b5c814074feb8421f299dcd0a11d%26pid%3D100966%26rk%3D4%26rkt%3D4%26b%3D1%26sd%3D333238109576%26itm%3D302885208449%26pmt%3D0%26noa%3D1%26pg%3D1&ul_noapp=true&var=601795012605

It will work. As far as I know, every pulley is a little bit wider than belt. Try meassuring your 12mm pulley, its probably 13 or 14mm wide