There are other examples that are much worse for French learners! In _fils_ (son) the _l_ is mute, but the _s_ is pronounced. In _août_ (August), tha _a_ is mute. In _tous_ (all, plural) the _s_ can be mute or not, depending on the sentence. And in _oeuf_ (egg) the f is pronounced, but in the plural _oeufs_ it isn't! A special mention to _Monsieur_ (Mister), which is pronounced as if it was written _Messieur_.