Chill touchs "cant regain hitpoints" lasts until start of enemies turn, instead of my turn

While fighting a certain enemy that heals himself with most of his attacks, I started to fall back onto the spell "chill touch" thinking it would be an amazing counter, since on a hit the spell says the target "cant regain hit points until the start of your next turn."
However it sadly did nearly nothing, since instead of ending at the start of the users next turn, it ends at the start of the affected enemies next turn, basically making it useless against enemies that heal during their turn.
This is nothing gamebreaking but it makes a rather situational spell even worse, so itd be great if you could fix it soon.