This study analyses the mixed-integer linear program (MILP) proposed by Kannan etal. [Kannan, G., Noorul Hag, A., and Devika, M., 2009. Analysis of closed loop supply chain using genetic algorithm and particle swarm optimization. International Journal of Production Research, 47 (5), 1175-1200] in their paper entitled Analysis of closed loop supply chain using genetic algorithm and particle swarm optimisation. Since we find inconsistencies in the model, we propose modifications to rectify the flaws. The revised model is presented and tested using a hypothetical problem. © 2012 Copyright Taylor and Francis Group, LLC.