  We study the membrane scattering in the three-dimensional N=6 supersymmetric
Chern-Simons theory recently constructed by Aharony, Bergman, Jafferis and
Maldacena and conjectured to be dual to M-theory on $AdS_4 \times S^7/Z_k$. We
compute the one-loop effective action up to the $v^4$ terms in the derivative
expansion and find exact agreement with the results from the supergravity
computations. In particular, our results imply that the $v^2$ term is not
renormalized and tree-level exact.
