Runners have had their best times invalidated after it was discovered the course for last year's Great Scottish Run half-marathon was 150m short.
Organisers have had to apologise to runners in the Glasgow event after it was revealed by competitors that the official distance came up short of the full 13.1 miles, the BBC reports.
The mistake also wipes out the record time set by winner Callum Hawkins
About 32,000 competitors took part in the event last October.
"Great Run take responsibility for the miscalculation and we apologise unreservedly to the runners and to the City of Glasgow," Race director Andy Mitchelmore told the BBC.
"This was an isolated incident. In the 30 years since the company was formed, more than four million people have participated in hundreds of our running events and the distances, which are measured by qualified independent parties, have been correct."