An assembly for a drug delivery device (1) comprises a housing (11), at least one stop feature (36) and at least one blocking member (34). For setting a dose of a drug (5), the stop feature (36) is configured to be rotated in a dose setting direction with respect to the blocking member (34) and with respect to the housing (11). For delivering the set dose of the drug (5), the blocking member (34) is configured to be axially displaced with respect to the stop feature (36) away from an axial starting position and towards an axial interaction position. When the blocking member (34) is in the axial starting position, the blocking member (34) is axially offset from the stop feature (36) and, when the blocking member (34) is in the axial interaction position, the blocking member (34) is configured to mechanically cooperate with the stop feature (36) such that rotation of the stop feature (36) in the dose setting direction with respect to the housing (11) is prevented.
