Even if Benny Blanco made the song, it doesn’t mean he’s going to remember it forever.

The record producer and songwriter made a recent appearance on Jake Shane’s Therapuss podcast, where he admitted that he has to look up his own songs sometimes.

“The first, like, big pop thing that I ever worked on was Britney Spears,” Blanco said when Shane asked him who the first successful person he worked with was. “Sometimes I am in a restaurant and I’m like, ‘Oh my god, this song’s so good.’ And I Shazam it, and then it’s my own song.” Shazam is an app that names songs in seconds by analyzing a short audio sample.

He added that he occasionally doesn’t realize it’s his own songs because “I’m old and I can’t remember anything. And I’ve done like hundreds of songs that have come out,” as he noted that “he’s been making songs for 16 years.”

When Blanco saw Shane’s confused look on his face, he asked the comedian, “Do you remember every single podcast, every word you said? … Let’s say you’re on your 16th season of your podcast and someone’s like, ‘Did you interview Chelsea Handler?’ And you’re like, ‘I think so?’”

“Oh, I guess you’re right,” Shane responded.

The producer, who is engaged to Selena Gomez, has collaborated with numerous artists over the years, creating some of the biggest hits, including Justin Bieber’s “Love Yourself,” Katy Perry’s “Teenage Dream,” Rihanna’s “Diamonds,” Maroon 5’s “Moves Like Jagger” and more. Blanco also worked on Gomez’s 2015 song “Same Old Love” before they started dating, and most recently worked on their collaborative album, I Said I Love You First, which released earlier this year.