The southeast Asian country would be the fourth-smallest producer in the Organization of the Petroleum Exporting Countries ahead of Libya, Ecuador and Qatar, and bring the number of participants to 13 countries.
Indonesia was the only Asian OPEC member for nearly 50 years before leaving the group at the start of 2009 as oil prices hit a record high, and rising domestic demand and falling production turned it into a net oil importer.
In a statement, OPEC said Indonesia's request to reactivate its full membership was circulated to OPEC members and following their feedback, OPEC's next meeting on Dec. 4 will include the formalities of reactivating its membership.
"Indonesia has contributed much to OPEC's history," the statement from the group's Vienna headquarters said. "We welcome its return to the Organization."
Indonesia's Energy Minister, who OPEC said will be invited to December's meeting, told Reuters earlier on Tuesday the country would return as a full member.
OPEC pumps more than a third of the world's oil and is engaged in a defense of market share, having dropped its long-standing policy of cutting output to support prices in November 2014.
The addition of Indonesia's output will boost OPEC's production by about 2.6 percent based on July output figures towards 33 million barrels per day (bpd) - far in excess of OPEC's 30 million bpd official target.
OPEC output has not been above 32 million bpd since 2008, before Indonesia's exit.
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