A Massachusetts man has been arrested for selling marijuana after he advertised his services on Craigslist.

The ad Christopher Gray posted was headlined “420 help is here” and said “Give me a ring if you need some help.” 420 is a term used to signify pot. Police took him up on the offer, and Gray handed over a small bag of pot in exchange for $45 before being arrested.

According to Fox Boston, Gray was unavailable for comment.