New shiny coins are causing problems for motorists wanting to pay for parking at the Brewery NCP car park, off Monsoon Avenue, Cheltenham.
People returning to their cars on Saturday night were told to hunt around for older, worn coins instead.
A parking attendant, who was helping motorists pay for their parking at a ground floor payment machine, said: “It doesn’t like new pound coins as they are too shiny. The machine needs to be calibrated.
One motorist, Marti Toth-Norris, from Up Hatherley, was trying to pay for parking after seeing American Hustle at Cineworld.
She said: “My husband was hunting through a pile of coins as the attendant was saying ‘too shiny, that’s too shiny, that one is okay.”
“We had to pay £4 and he had lots of change, but most of the coins were shiny as they had been minted in 2013.
“We just about got there though, with a final, worn 20p giving us enough money.”