An academic study disputes Paul McCartney’s claims that he wrote part of the Beatles classic “In My Life” and that it was actually John Lennon.

McCartney said in an interview a decade after its release that he wrote the music for the 1965 song, which is credited to Lennon. Lennon prior to his death in 1980 revealed that McCartney only wrote the middle-eight and harmonies.

The study conducted by Harvard’s senior lecturer in statistics Mark Glickman and Dalhousie University’s Jason Brown concludes that McCartney most likely “misremembers” writing “In My Life” because stylistically the song is much more like one of Lennon’s other works. The researchers give McCartney a 1-in-50 chance that he really wrote the song, “Which basically means it’s pretty convincingly a Lennon song.”