We could do with sorting out the indentation in this file, really. There's a mix of four-space indentation, eight-space indentation, and tab indentation. The line above this is indented with eight spaces and then one tab character. I'm happy to make this line match that for now, but if you want to decide on just one indentation style I'll happily send a subsequent pull request converting the entire file to that standard to avoid this issue in future.