Exeter City players say the decision to award a first penalty against Troy Archibald-Henville at Leyton Orient was harsh, according to boss Paul Tisdale.
The defender was penalised after the ball hit his arm with 25 minutes to go, and Kevin Lisbie scored to make it 1-0, the first of Orient's three.
"The players are all complaining about the first penalty," Tisdale said.
"He seems to think his hands were planted by the side of his body and he could do nothing about it."
He added to BBC Radio Devon: "We see lots of those type of penalties given where the player seems to have no choice but to get in the way and the ball hits his arm."
And Tisdale said the first goal led to his side's downfall as they tried to chase the game.
"The last 20 minutes weren't good, but we'd gone behind and we were fragmented," he said.
"We had no real flow, we didn't find our lines and our pattern and our purpose that was going to get us something."