FILE PHOTO: Abiye Ahmed addresses a news conference in Addis Ababa, Ethiopia December 4, 2015. REUTERS/Stringer

ADDIS ABABA (Reuters) - Ethiopia’s prime minister-elect Abiye Ahmed will be sworn in on Monday, its parliament said, after the ruling coalition chose him to succeed Hailemariam Desalegn as its chairperson.

The ruling Ethiopian People’s Revolutionary Democratic Front coalition on Tuesday voted in the 42-year-old, a retired lieutenant general from Ethiopia’s largest ethnic group, the Oromo, to take over the government.

Ethiopia is Africa’s second most populous country and has had the fastest growing economy on the continent for the past decade, but protests that began in 2015 have caused the biggest threat to the EPRDF since it took power in 1991.

“The House of People’s Representatives will hold an extraordinary session on April 2 to swear in Dr. Abiye Ahmed,” the body said in a statement.

His predecessor Hailemariam, from the small Wollayta ethnic group, resigned last month after sustained protests in the Oromiya and Ahmara regions where people say they are politically and economically marginalized.

Abiye will now face pressure to appeal to legions of disaffected youth and to push through promised reforms.

The event was initially scheduled for Saturday. The statement did not give a reason for the postponement.