In the title mol-ecule, C(10)H(9)NO, the dihedral angle between the mean plane of the cyclo-propane ring and the essentially planar [maximum deviation = 0.032 (2) Å] indole ring system is 87.65 (17)°. In the crystal, inter-molecular N-H⋯O hydrogen bonds link mol-ecules into one-dimensional chains along [100].