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Computational grids are large scale computing systems composed of geographically distributed resources (computers, storage etc.) owned by self interested agents or organizations. These agents may manipulate the resource allocation algorithm for their own benefit and their selfish behavior may lead to severe performance degradation and poor efficiency. In this paper we investigate the problem of designing protocols for resource allocation involving selfish agents. Solving this kind of problem is the object of mechanism design theory. Using this theory we design a truthful mechanism for solving the static load balancing problem in heterogeneous distributed systems. We prove that by using the optimal allocation algorithm the output function admits a truthful payment scheme satisfying voluntary participation. We derive a protocol that implements our mechanism and present experiments to show its effectiveness.