At 2018's final policy review, Bank Indonesia (BI) held the 7-day reverse repurchase rate at 6.00 percent, as predicted by 20 of 21 analysts in a Reuters poll.

Between May and November, the rate was raised six times by a total of 175 basis points as BI sought to slow capital outflows and put a floor under the rupiah.

BI's other main rates, the deposit facility and lending facility rates, were kept unchanged as well at 5.25 percent and 6.75 percent, respectively.

The rupiah has been under pressure for much of this year due to U.S. monetary tightening, the Sino-U.S. trade war and a widening in Indonesia's current account deficit.

Thursday's decision came hours after the Federal Reserve raised U.S. rates for a fourth time this year and signalled more hikes ahead.