[5(6)-(benzisoxa-, benzisothia- or indazol-3-yl)-1H-benzimidazol-2-yl]carbamates of formula (I) wherein R.sup.1 is hydrogen, C.sub.1-4 alkyl, halo, hydroxy or C.sub.1-4 alkyloxy; R.sup.2 is C.sub.1-4 alkyl; and X is O, S, SO, SO.sub.2 or NR.sup.3, said R.sup.3 being hydrogen, C.sub.1-4 alkyl, aryl or arylC.sub.1-4 alkyl. The compounds of formula (I) have anthelminthic properties. Compositions containing said compounds as active ingredient, a method of combating helminths, and a process for preparing said compounds and compositions.