James Pattinson knows he must improve his run-up if he is to remain an integral part of Australia's bowling attack having seen two wickets struck off after he overstepped.
The quick added two wickets to his overnight haul on Monday as he finished West Indies' first innings with 4-72, but he saw two dismissals of Carlos Brathwaite (59) over-ruled as a result of no-balls.
Pattinson registered four illegal deliveries in his 22.3 overs and although they were not costly this time - West Indies were bowled out for 271 in response to Australia's 551-3 declared - he knows he needs to eradicate them from his game.
"I've always been pushing the line, ever since I've been playing cricket," Pattinson said. "It's momentum and stepping over the line, it's obviously something I have to work on because it cost us a bit of time today and a few runs.
"I still feel like I'm not 100 per cent yet. Obviously when you do bowl no-balls it is in the back of your mind a little bit. So I'm still not running in as hard as I would like to be, because I'm sort of a bit wary of that front foot.
"I've just got to try to get a stage where I'm running in full steam and not worrying about overstepping, but apart from that I'm pretty happy with the way the ball is coming out.
"I feel like I'm getting better and better each time I bowl. If that's the worst it's going to get - bowling a couple of no-balls, I'll take that.
"I've got to try and get into a rhythm where I can stay behind the line and not push it but umpires do try and help you out a fair bit."