Mack released a screen shot of a text message he says he sent the TDE star after the award show.
"You got robbed," Macklemore says in the text message. "I wanted you to win. You should have. It's weird and sucks that I robbed you."
Mack says he hoped to address the matter during his speech, but says he was unable to when "the music started playing." He says he "froze."
Macklemore & Ryan Lewis won four Grammy awards, including Best Rap Album and Best Rap Song.
The caption for the image can be found below following the screenshot of the text message Macklemore posted on Instagram.
My text to Kendrick after the show. He deserved best rap album... I'm honored and completely blown away to win anything much less 4 Grammys. But in that category, he should have won IMO. And that's taking nothing away from The Heist. Just giving GKMC it's proper respect.. With that being said, thank you to the fans. You're the reason we were on that stage tonight. And to play Same Love on that platform was a career highlight. The greatest honor of all. That's what this is about. Progress and art. Thank you. #grammys
Their text message exchange follows a previous post Macklemore made showcasing their mutual respect for one another.