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During Sunday’s Bills-Patriots game, referee Pete Morelli used profanity, while his microphone was turned on.

During what he thought was a private conversation with another official but was actually as loud and clear as Frank Dreben’s trip to the restroom, Morelli used a four-letter word.

“Turned into a pretty good game. But one big hit, this s— could explode,” Morelli said.

The TV broadcast was in a commercial break at the time, but the fans in the stands could hear what Morelli said.

ESPN reports that the league will address Morelli’s language internally and that Morelli is not suspended.