Stanford will replace all diplomas issued over the past four quarters in order to correct an outdated signature, according to an email sent Thursday morning by the Office of the Registrar.

Diplomas issued for last summer quarter  and this academic year’s autumn, winter and spring quarters bore the signature of former Board of Trustees chair Leslie Hume M.A. ’71 Ph.D. ’79 rather than current Board chair Steven Denning MBA ’78. Denning began his two-year term in July 2012.

“This error does not affect your graduation status, but the University will replace your diploma with a corrected version,” the email read.

While the diploma serves as a commemoration of achievement, official certification of degrees is made only through official transcripts or through the National Student Clearinghouse.

Graduates affected by the error have been asked to fill out an online form to allow the University to mail a corrected diploma.

This post will be updated.