INDONESIA’S government plans to force commodity exporters to keep their entire foreign currency-denominated earnings onshore for at least a year, underscoring concerns about recent weakness in the rupiah.

Indonesia will require natural resource exporters to hold all proceeds onshore for at least one year, its chief economic minister said on Tuesday, a move that could boost the country's foreign exchange reserves by $90 billion a year and support the local currency.

Oil and gas exporters in Indonesia will be exempted from the new rule mandating that all proceeds from natural resource exports be kept onshore for a year, according to a Reuters report. The exemption comes after companies raised concerns about the Indonesian rule’s potential impact on their cash flows and urged adjustments.