Device for adjusting the length of a bracelet, including at least one adjusting link element (23) mounted with the ability to rotate about a first axis (A1), the adjusting link element (23) being connected to an end link element (25) of a bracelet by a connecting pin (26), so that the end link element (25) can occupy two positions, each of these two positions respectively corresponding to a short and long configuration of the length of the bracelet, and wherein the bracelet length adjustment device includes an elastic fastening device so as to elastically fasten together the at least one adjusting link element (23) and the end link element (25) in the short configuration, in which configuration the elastic fastening device is arranged around a third axis (A3) that is not aligned with the first axis (A1).