After finishing their show, a huge "THANK YOU PITTSBURG" lit up the screen behind them, the 'H' noticeably missing.
"1 easy way to make Pittsburgh hate the Chainsmokers, forever." One fan tweeted.
The duo aren't taking the blunder too seriously, admitting that they can redeem themselves this week in "Clevlande."
We all know how the internet feels about a spelling/grammatical error.