The notion of epistemic injustice has in recent years gained recognition within social and political philosophy. Epistemic injustice is the idea that someone can be unfairly discriminated against in our capacity as a knower and that unfair and unjust communicative structures, institutions, and practices have the potential to reproduce and further exacerbate existing socioeconomic inequalities and injustices. Yet, the literature on epistemic injustice has mainly focused on what makes an epistemic injustice epistemic – as opposed to distributive or socioeconomic – and little attention has been paid to what exactly makes it an injustice. This paper fills this lacuna by asking under what conditions epistemic discrimination suffered by a knower becomes an epistemic injustice and identifies five partial conditions that can be used to evaluate claims of epistemic injustice.