A tamper-evident attachment for a cable tie includes a ratchet head cover configured to couple to a ratchet head of the cable tie such that the ratchet head cover covers at least a portion of a head opening of the ratchet head to inhibit access a pawl in the ratchet head. The ratchet head cover defines at least one slot-shaped opening configured to align with the head opening of the ratchet head when the ratchet head cover is coupled to the ratchet head. The at least one slot-shaped opening is sized and shaped to receive a strap of the cable tie therethrough.