Royal Bank of Scotland's chief risk officer, Peter Nathaniel, has announced that he’ll be stepping down—just days after the $37.4 billion bank hired Nathan Bostock as head of restructuring and risk.

For the time being, Bostock will be in charge of all risk reporting until the company finds a replacement for Nathaniel, including taking over as chair of the group risk board and all other relevant risk committees.

Nathaniel joined Royal Bank of Scotland in 2007. Prior to that, he was managing director and head of global risk oversight for Citigroup.