'Line of Duty' has been commissioned for a fifth series.
Vicky McClure in Line of Duty
The award-winning police drama, created by Jed Mercurio, will be returning to screens and will also move over to BBC One from BBC Two for a further two instalments with the fourth confirmed to start filming in August and air next year.
The channel move is being made in a bid to make the already popular show reach a "broader audience" and allow new dramas to "flourish" on BBC Two.
Charlotte Moore, BBC Controller of TV Channels and iPlayer, said: "'Line of Duty' is original, bold, gripping drama that gets the nation talking and the time is right to bring the series to an even broader audience on BBC One.
"Jed Mercurio's explosive thriller will find a new home on BBC One for two more series and create room for new drama to flourish on BBC Two.
"It's an immense privilege to be able to reward 'Line of Duty fans with two more series on BBC One."
As of now Mercurio hasn't begin writing the script for series four, which will star Martin Compston and Keeley Hawes, but he's not stressing too much as he never had a "grand plan" for series three.
Last month, he said: "We've got a fourth season and we're just at the very start of the process of what the story will be in season four and how it will unfold.
"In terms of season three there was no grand plan. It was only as we were working through it that we started to decide what kind of story might unfold."
Tagged in Keeley Hawes Martin Compston