We analyze changes in financial aid and student enrollment at historically Black colleges and universities (HBCUs) that occurred after the U.S. Department of Education increased the credit history requirements necessary to obtain Parent Loans for Undergraduate Students (PLUS). We use institution-level data to examine financial aid and enrollment changes in the first two academic years affected by the new credit standards (2012-13 and 2013-14). The results show that PLUS loans declined substantially at HBCUs in 2012-13, and the decreases were not fully replaced by other types of federal financial aid. HBCUs also experienced larger declines in enrollment than other institutions--particularly for first-year students. Though PLUS loans increased somewhat in 2013-14 after the U.S. Department of Education streamlined the appeals process for PLUS denials, enrollment at HBCUs continued to decline.