A device for blow-molding containers, the device comprising a structure and a platform mounted to rotate on the structure about an axis of rotation, the platform being provided with blower members and with molds that are mounted under the blower members, each of which comprises a stationary mold portion and a movable mold portion that is movable by control means between an open position and a closed position for the mold, wherein the device includes blocking members for blocking the molds in the closed state, each blocking member comprising a strut mounted on the platform to move between a retracted position and a blocking position.