When the company originally announced its results, it reported earnings before interest, tax and ordinary items, giving it a favourable comparison with the €250m it reported in 2000.
The restated €81.3m sees its 2001 figures down by about two-thirds on 2000.
Earlier this year, Alain de Pouzilhac, chairman of the French group, predicted a 2% decline in worldwide advertising spend.
The company did not, however, hide a restructuring charge of €152m, which plunged the company into a €58m net loss against a net profit of €89m last time.
France's stock exchange watchdog, la Commissions des Operations de Bourse, asked the company to refile its accounts in line with US generally accepted accounting principles.
Havas spokeswoman Catherine Francois said: "The 2001 restructuring charge relates to the 5%-10% contraction in the advertising sector, which prompted the group to shed jobs and cancel office leases. Nobody is forecasting that will happen again this year."
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