The FIA's WMSC has tweaked the 2016 Sporting Regulations in order to allow Pirelli 25 days of testing.
The move, which followed a threat by the Italian manufacturer to walk away from the sport at the end of the year, was confirmed in a brief statement issued today.
The statement reads:
"The World Motor Sport Council today approved changes to Articles 10.2 and 10.6 of the Formula One Sporting Regulations in order to provide the appointed tyre supplier additional opportunities to undertake testing in preparation for the 2017 season.
The further testing was deemed to be essential for the purpose of developing the new tyre sizes permitted by the 2017 F1 Technical Regulations.
The changes will allow 25 car days of testing with current cars, fitted with 2017 tyre sizes, in 2016, 2017 and 2018.
In addition, there will be an opportunity to test prototype 2017 tyres (in 2016 sizes) on 2013 or 2014 cars - these tests on older cars only apply in 2016."