Indianapolis will host the 2007 US Grand Prix after organisers agreed a deal with F1 boss Bernie Ecclestone.
The most recent contract for the Grand Prix to run at the Brickyard expired after this year's race on 2 July.
Its future was jeopardised in 2005 when tyre safety fears reduced it a farce, with 14 out of 20 drivers withdrawn.
"This shouldn't be a message of any type that this event doesn't have a long-term future," said track spokesman Ron Green of the new one-year deal.
"We are committed to keeping the US Grand Prix in Indianapolis for a long, long time." The US Grand Prix first came to Indianapolis, home of the Indy 500 race, in 2000.
Next year's GP is tentatively scheduled for 17 June.