An electrical connector has a casing configured to define a chamber when mated with a mating connector, a plurality of contact pins projecting from the casing into the chamber when mated with the mating connector, and a moisture-absorbing pin retained by the casing for movement between a retracted position wherein the moisture-absorbing pin is substantially enclosed by the casing and an extended position wherein the moisture-absorbing pin extends into the chamber. A fluid is contained within the casing that is compressed by a movement of at least one of the contact pins during engagement of the electrical connector with the mating connector, compression of the fluid urging the moisture absorbing pin from the retracted position to the extended position.