Assen has extended its MotoGP hosting contract through to the 2021 season.
The historic Dutch venue has been on the motorcycle world championship calendar for a record 65 consecutive years, and was first used for the Dutch TT in 1925.
It remains one of the most popular events of the MotoGP season despite 2006 track revisions that took away many of its fastest sections.
MotoGP commercial chief Carmelo Ezpeleta said it was important to firm up Assen's status into the next decade.
"There's a reason why Assen is the longest serving track on the calendar," he said.
"Its fast nature and excellent layout make it ideal not only for MotoGP bikes and their support classes, but also for the vast number of spectators that turn out every year.
"The contract was already signed until 2017, yet we felt the time was right to really cement it on the calendar and keep the pinnacle of motorcycle racing at 'the cathedral' for many years to come."
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