A range of the economic development literature focuses on the debate of whether international standards exclude small-scale farmers from highvalue food markets. Nonetheless, when exclusion is pointed out, very little is said about the extent of the problems of such forms of exclusion are. In this paper, we examine how small farmers are affected by their lack of certification. Based on primary data collected to examine the effects of GlobalGAP on the mango sector in Peru, we find a significant number of excluded farmers. These farmers face greater price risk while their bargaining power and agricultural income have decreased.