After his LinkedIn post calling out legal rankings giant Chambers & Partners for the dearth of women in its rankings went viral, a Mayer Brown partner went one step further this week, asking to be removed from the company’s listings—and urging other men in his practice area to do the same.

In an open letter, Chris Arnold, a London partner in Mayer Brown’s derivatives and structured products practice, asked to be removed from Chambers’ 2020 U.K. derivatives rankings because only one woman made the list out of 18 lawyers recognized. In Chambers’ global derivatives rankings from this year, only two of the 27 ranked lawyers are women.