Augustine’s writings certainly played a significant role in shaping Calvin’s doctrine, despite Calvin’s divergences from his thought. Augustine is referenced 222 times in the 1559 Institutes alone, and 25 of those are in the chapters on predestination, where Calvin repeatedly uses Augustine’s words to express his own understanding, to answer objections, and to summarize his teaching [cf. Calvin, Institutes, 3.23.13-14.]. Nevertheless, thought Calvin defended Augustine’s doctrine of election, he parted ways with him on several significant factors relative to reprobation, and on Augustine’s view of the relationship between predestination and providence, as well as Augustine’s philosophy in general.

Joel R. Beeke, Debated Issues in Sovereign Predestination: Early Lutheran Predestination, Calvinian Reprobation, and Variations in Genevan Lapsarianism, 96-97.