In the crystal of the title compound, C(8)H(8)ClN(3)S, mol-ecules are connected by N-H⋯S hydrogen bonds into strips parallel to the (112) planes and running along [10]. One of the amino H atoms is not involved in a classical hydrogen bond. In addition, there is a rather short inter-molecular Cl⋯S distance of 3.3814 (5) Å.