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The problem of controller design for a class of linear discrete delay systems subject to controller failures is studied. The discrete switched delay systems are used to describe the considered systems. Then, based on the average dwell-time scheme, under the condition that the activation time ratio between the system without controller failures and the system with controller failures is not less than a specified constant, the state feedback controller is developed in terms of linear matrix inequalities such that the resulting closed-loop system is exponentially stable. At last, a numerical example is given to illustrate the effectiveness of the proposed method.