Frankie Muniz just gave Malcolm in the Middle fans a heavy dose of nostalgia — and maybe a few gray hairs. The actor took to social media this morning to share the first behind-the-scenes photo from the upcoming Malcolm in the Middle revival, showing him reunited with co-stars Justin Berfield and Christopher Masterson on set.

“I was told not to post this yet,” Muniz wrote, “but then I remembered the theme song. I’m just too excited for y’all to see the new episodes and I miss my brothers.”

If you know, you know — that’s a perfect nod to the iconic They Might Be Giants theme song, which famously repeats the lyric, “You’re not the boss of me now.”