An integrated circuit chip is mounted to a front face of a support plate. An encapsulation cap in then mounted to the support plate. The encapsulation cap includes a front wall and a peripheral wall having an end edge at least partly facing a peripheral zone of the support plate. The support plate and the encapsulation cap delimit a chamber in which the integrated circuit chip is situated. To mount the encapsulation cap, a bead of glue is inserted between the peripheral zone and the end edge of the peripheral wall of the encapsulation cap. A peripheral outer face of the encapsulation cap includes a recess extending from the end edge which locally uncovers a part of the bead of glue. A local hardening of the glue at the recess is performed as a first attachment step. Further hardening of the remainder of the glue is then performed.