Millions of people who were mis-sold pensions have until Friday evening to make a claim against their insurance company.
Over three million people have had letters asking them if they want to apply for a review of their pension.
So far, only one million have replied, raising fears that many people will not get the compensation they are owed.
Since a review of the pensions scandal began in 1994, 400,000 people have received £3bn worth of compensation, on average £7,500 each.
The FSA says victims can still get compensation after Friday's deadline by going through their pension company's normal complaints procedure.