In the title compound, C(11)H(9)ClN(2)O, the fused-ring system is essentially planar, with a maximum deviation of 0.0323 (16) Å. In the crystal, mol-ecules are connected by N-H⋯O hydrogen bonds forming a zigzag chain along the c axis. Mol-ecules are further stacked along the a axis through weak π-π inter-actions, the shortest distance between ring centroids being 3.6476 (8) Å.