Nouns ending in -is are usually masculine.
Is permis masculine or feminine?
lepermis
The rule behind it
94.1% of -is nouns are masculine
In context
Mon permis de conduire expire la semaine prochaine.
My driver's license will expire next week.
Mon permis de conduire m'a été confisqué.
My license was confiscated.
Elle n'a pas de permis de conduire.
She doesn't have a driving licence.