The Birmingham International Marathon has been cancelled because of 'ongoing roadworks'.
Organisers have called off the event so that the route can be 'redesigned' for the 2022 Commonwealth Games.
An estimated 22,000 runners took part last year - three decades after the Second City last hosted a marathon.
But ongoing redevelopment and roadworks at key areas in the city centre have restricted options for a new and improved route.
In a statement, The Great Run Company apologised and said they wanted to create an 'iconic' route, which wasn't possible at the minute.
Anyone who has already signed up will be given a full refund and offered discounted entry to the half marathon in October.
Cllr Ian Ward, Leader of Birmingham City Council, added:
The Simplyhealth Great Birmingham 10K takes place on Sunday 6 May and the Simplyhealth Junior & Mini Great Birmingham Run for children and families will go ahead on Saturday 13 October.