One safety aspect of a material-based hydrogen storage system is the exposure of such system to a high-temperature environment (e.g., a fire) causing an increase in pressure. A simple analysis, based on a material balance, is provided to estimate the effect of temperature on equilibrium storage pressure in a material-based hydrogen storage system. Jiann C. Yang in Int I Hydrogen Energy 33 (2008) 4424-4426. Published by Elsevier Ltd on behalf of International Association for Hydrogen Energy.