A decision to revoke a £70,000 compensation payout for a Hanwell police officer has been upheld by the Court of Appeal.
Detective sergeant Gurpal Virdi claimed he suffered discrimination when he applied for a promotion in 2005.
He was awarded the cash in June last year, but the decision was overturned after an appeal by the Metropolitan Police.
A Met spokesman said the force was "pleased" after appeal judges this week upheld the tribunal's decision.
He added: "We are disappointed that he felt it necessary to bring this case at all.
"Metropolitan Police Service policy and practice is designed to allow all members of the service to fulfil their potential regardless of ethnicity or faith. DS Virdi is and remains a valued officer."
The decision comes at the same time as the launch of a major inquiry into discrimination within the London force.
The Metropolitan Police Authority Race and Faith review was set up by Mayor Boris Johnson last year after a string of race-related claims.