It’s taking former President Barack Obama longer to write his next book than he expected because he’s writing it, rather than using a ghostwriter like his wife did, according to a new report.

Sources who have spoken to Obama claim the former president feels a bit competitive with Michelle Obama, given that her latest book is poised to become the best-selling memoir ever. But Obama has said that he is authoring the book on his own, whereas his wife employed a ghostwriter, The Atlantic reports.