A fixing device for fixing a dispensing member to the neck of a receptacle, said fixing device comprising: a fixing ring comprising a bottom skirt serving to come into engagement with a neck of a receptacle, member-receiving means for receiving a dispensing member such as a pump or a valve, and a top socket which extends in the direction opposite to the direction in which the skirt extends, said socket defining an outside surface and an inside surface; and trim which extends around the ring so as to mask it at least in part, the trim comprising a body defining a top end forming an inwardly-extending rim that extends inwards and then downwards so as to define a substantially cylindrical inner sleeve, said sleeve coming into engagement with the inside surface of the socket; wherein the inner sleeve forms at least one resilient tab which extends outwards and upwards so as to define a free end which comes into contact with the inside surface of the socket.