It appears former workers of Chatham's Navistar plant, who've waited years for a pension, will have to wait longer.

With just days before a month-long deadline, Navistar is appealing a decision by the provincial pension regulator.

The Financial Services Commission of Ontario handed down a decision in a long fought dispute between the company and the CAW.

CAW president Ken Lewenza says he is outraged they are appealing the decision that affected the pension rights of over 800 former employees.

"It is shameful that this company willingly wants to spend the time and money to continue fighting its former workers, many of whom spent their entire lives producing the heavy trucks that Navistar sold to earn profits for its shareholders and executives," says Lewenza.

The FSCO decision issued in March covered four key issues in the dispute, including the date of the wind up of the pension plan, the early retirement programs in the pension agreement, the pension entitlements of those who retired before the wind up date of July 28, 2011 and credited service upon layoff.

The official date the plant closed was July 2011. It was idled in 2009.

The matter will now go before a tribunal.