The Bills activated DB Jon Corto to the 53-man roster on Friday and waived DB Cary Harris.
Corto spent the first six weeks of the season on the physically-unable-to-perform list. The third-year veteran is a Buffalo native and has played in all 16 games the past two seasons.
Harris played in two games this season, recording one tackle. He had two interceptions in just four games in 2009.