Clarence House vowed at the time of the royal couple's 2005 wedding that the Duchess of Cornwall would be given the title "Princess Consort" when he takes the throne.
The vow was seen to be a respectful nod to first wife, Princess Diana.
However, the press statement confirming the long-standing policy has disappeared from Charles’ official website and reference has been stripped out of the "frequently asked questions".
Up until the end of last year, the FAQ section read: "Will the Duchess become Queen when The Prince becomes King? "As was explained at the time of their wedding in April 2005, it is intended that The Duchess will be known as HRH The Princess Consort when The Prince of Wales accedes to The Throne."
The statement has now been removed entirely, and even a biography of Camilla on the Prince of Wales’ site no longer features the vow.
Buckingham Palace’s website also appears to have removed the reference in its profile of Prince Charles’ wife.
Earlier this week, Clarence House officials insisted the statement had been removed in 2015 because the public was no longer interested in the issue.
One aide said: “This question was taken off the FAQs a few years ago as it was a relevant question when Their Royal Highnesses got married, but isn’t frequently asked by the public anymore, only by the media.”
In November 2010, Charles appeared to hint at Camilla becoming Queen.
In an interview with US television channel NBC, the royal was asked if Camilla would be Queen, he replied: “We’ll see, won’t we? That could be.”
Earlier the same year when an eight-year-old girl asked her: “Are you going to be Queen one day?” Camilla replied: “You never know.”