Saudi Arabia's Crown Prince Mohammed bin Salman has "ordered the immediate release" during his high-profile visit to Islamabad.
In a post on Twitter, Pakistan's Information Minister Fawad Chaudhry said the crown prince took the call following a request by Pakistani Prime Minister Imran Khan.
Prince Mohammed is in Pakistan at the beginning of an Asian tour, which will include India and China.
This comes as Saudi Arabia on Sunday signed investment agreements with Pakistan worth $20 billion.
Saudi Arabia has yet to comment on the Pakistani announcement of a prisoner release.

Trump says US officials will be in Pakistan for negotiations
Eight children killed in Louisiana mass shooting, media reports say
Strait of Hormuz blocked as gaps remain on Iran peace talks
UK police arrest seven over nationwide plan to shoplift from high-end stores
Iranian President insists on country's nuclear rights, ISNA reports
