An anti-misuse system for a sheet dispenser having a roll of sheet material and a housing to receive the roll. The anti-misuse system includes an end portion of a roll incorporating a first projection and a corresponding end wall portion of the housing comprising a retracting portion incorporating an interacting mechanism. The retracting portion is movable between a deployed position in which the interacting mechanism affects the functionality of the sheet dispenser and a retracted position in which the interacting mechanism enables the sheet dispenser to be functional. The retracting portion further incorporates an abutment drivable by the projection upon insertion of the roll into the housing to move the retracting portion into the retracted position.