The top editor of The Philadelphia Inquirer has resigned amid backlash over the headline “Buildings Matter, Too” — a riff on “Black Lives Matter” — which was published in the paper last week during nationwide anti-racism protests.

In a statement Saturday, publisher Lisa Hughes said Stan Wischnowski, the paper’s executive editor and vice president, had decided to step down after working at the Inquirer for 20 years.

The Inquirer published the headline, which suggested an equivalence between buildings and Black lives, in the paper’s Tuesday print edition, alongside a column arguing against the destruction and looting of buildings during anti-racism protests.

At least 40 journalists of color working at the Inquirer signed an open letter to the paper’s leadership about systemic racism in the journalism industry and the U.S. broadly.

Wischnowski, along with Inquirer editor Gabriel Escobar and managing editor Patrick Kerkstra, apologized for the “deeply offensive” and “unacceptable” headline in a letter to readers and Inquirer staffers posted online Wednesday.