The NFL has fined Dolphins running back Raheem Mostert for unnecessary roughness in last week’s game against the Bills.

Mostert lost $18,830 due to illegal use of his helmet.

On a third-and-11 play with 5:07 left in the first quarter, Mostert caught a short pass from Tua Tagovailoa. He ran up the middle for a 17-yard gain before sinking his head into the helmet of Bills safety Taylor Rapp. Officials threw a flag at Rapp for unnecessary roughness.

Rapp wasn’t fined for that hit since Mostert started it, but Rapp was fined $11,255 for taunting in the third quarter. He was not penalized for unsportsmanlike conduct in that game.

Dolphins safety Jordan Poyer was fined $11,193 for his unnecessary roughness on Bills wide receiver Keon Coleman. Poyer was penalized for the play. Coleman will not play this week with a wrist injury.

Dolphins cornerback Cam Smith was fined $8,874 for a horse-collar tackle.