Brad Stevens thinks Jayson Tatum should have been unanimously selected to the NBA All-Rookie First Team.

The Celtics picked Tatum with the No. 3 overall in the 2017 draft. He averaged 13.9 points – sixth amongst all first-year players –  5.0 rebounds and 1.6 assists per game this season. Tatum ended up as a first team All-Rookie selection, but one voter placed him on the second team.

Stevens told reporters Tuesday that shouldn’t have been the case.

“Somebody made a mistake,” Stevens said.

Jazz guard Donovan Mitchell and 76ers guard Ben Simmons both were unanimous selections. Bulls big man Lauri Markkanen and Lakers guard Kyle Kuzma rounded out the All-Rookie First Team.

Boston will look to take a 3-2 Eastern Conference finals lead over the Cavaliers Wednesday at 8:30 p.m. ET.