Miss. Code Ann. § 21-29-315

Any active member who previously received a refund under either Article 1, 3 or 5 and who was reemployed and again became a contributing member of the applicable retirement system may repay all amounts previously received as a refund, together with regular interest at the rate as determined by the board, covering the period from the date of refund to the date of repayment. Upon such repayment, the active member shall again receive credit for the entire period of creditable service that was forfeited upon the receipt of the refund.