The launch of Valve's upcoming Steam Machine hardware looks set to be held back to 2015.
Designer Eric Hope posted a message on the official Steam community site informing fans of the news and stating that the new controller is the main reason for the delay.
"We're now using wireless prototype controllers to conduct live playtests, with everyone from industry professionals to die-hard gamers to casual gamers," he explained.
"It's generating a ton of useful feedback, and it means we'll be able to make the controller a lot better. Of course, it's also keeping us pretty busy making all those improvements.
"Realistically, we're now looking at a release window of 2015, not 2014.
Obviously we're just as eager as you are to get a Steam Machine in your hands. But our number one priority is making sure that when you do, you'll be getting the best gaming experience possible. We hope you'll be patient with us while we get there. Until then, we'll continue to post updates as we have more stories to share."
Valve confirmed 14 third-party Steam Machines at the CES expo in Las Vegas in January 2014, complete with specs and pricing details.
However, the system's controller has continued to undergo redesigns since then, with a drastically altered design unveiled in March.
More recently, it was reported that the Steam Controller would not be released until October or November 2014, fuelling rumours of a Steam Machine delay which now appear to be accurate.
Of the manufacturers already confirmed to be making Steam machines, some had previously stated an expected release of mid-2014. This will likely now change following Valve's statement.