Ferrari and Red Bull have decided to tweak the days on which they will run during the final pre-season test in Barcelona.
All teams were initially scheduled to run from Thursday March 1 until Sunday March 4, but Ferrari decided to change their dates and opted to start on the Friday and continue until the Monday.
Red Bull decided to follow suit with team boss Christian Horner saying it makes more sense from a "logistical perspective".
"We have decided to join Ferrari in running from Friday to Monday as opposed to Thursday to Sunday. We're just moving it a day," Horner told Autosport.
"We asked Ferrari if we could join them, they agreed.
"It's in the test agreement and also within the test regs. We are within the time limit for that. It's something that we've elected to do."
Lotus, meanwhile, are expected to do an extra day's testing after they pulled out of the first Barcelona test on Tuesday with a chassis problem.
