A reform in 2003 increased the guaranteed minimum pension (minimum contributif)for general-scheme pensioners. The increase depends on the number of insured quarters contributed by the beneficiary. This article seeks to evaluate the impact of the 2003 reform on the level of pensions paid out by the general scheme to pensioners who retired between 2004 and 2006. After breaking down the theoretical effects of the amendment, its impact is analysed on the basis of real data about the flow of new general-scheme pensioners. It emerges that the impact of the guaranteed minimum pension reform is complex and varies with cohort and year of retirement. This complexity can be partly attributed to the fact that the reform is combined with an increase in the pro-rata coefficient used to calculate the earned entitlement, which absorbs some of the increase in the guaranteed minimum pension.