I argue that deontic modals are hyperintensional, that is, logical equivalent contents cannot be substituted in their scope. I give two arguments, one is deductive and the other abductive. First, I simply prove that the contrary thesis leads to falsity; second, I claim that a hyperintensional theory of deontic modals fares better than its rivals in terms of elegance, theoretical simplicity, and explanatory power (e.g. Ross’s paradox, the Gentle Murderer, The Good Samaritan, Free Choice Permission, and the Miners’ Paradox disappear). I then propose a philosophical analysis of this thesis, and outline some consequences.