Article 43 2.

Where periods of voluntary or optional continued insurance have not been taken into account under Article 12(3) of the implementing Regulation, the institution of the Member State under whose legislation those periods were completed shall calculate the amount corresponding to those periods under the legislation it applies. The actual amount of the benefit, calculated in accordance with Article 52(1)(b) of the basic Regulation, shall be increased by the amount corresponding to periods of voluntary or optional continued insurance.