Collins and Postal (2014) postulate that English NPIs represent two distinct structures: a unary NEG structure and a binary NEG structure. Some NPIs, such as any and ever expressions, can instantiate either of these two structures in different contexts. Others (such as one use of jackshit) have only unary NEG structures. The present article seeks to provide cross-linguistic support for this hypothesis by showing that the two series of NPIs in Serbian/Croatian (Progovac 1994) should be analyzed in terms of the two structure types postulated for English NPIs.