Parliament is to vote on the proposed change to the penal code today.
A royal reform committee has recommended repealing Article 308, but lawmakers have proposed amendments, including exempting from prosecution those who have consensual sex with a minor between the ages of 15 and 17, and then agree to marry the minor.
Human Rights Watch has called for repeal. It says Article 308 is "a blight on Jordan's human rights record."
Tunisia, Morocco and Egypt have scrapped similar clauses over the years.