Pavey, 20, has impressed since arriving on a three-month deal in January and will now be available for the Shots' final six matches of the campaign.
He has made 12 appearances for the National League side, five as a substitute, and has scored two goals.
Pavey spent much of last season on loan at Barnet, where he made three league appearances.
Aldershot Town have extended Millwall striker Alfie Pavey's loan spell until the end of the season.