Iran is willing to go with a majority decision at Wednesday's OPEC meeting, Iran's acting oil minister Mohammad Aliabadi said, Reuters reported.
"Iran is willing to go with the decision of the majority," Aliabadi told reporters ahead of a closed session of OPEC ministers.
"Iran is a member of OPEC and will go with the decision of the majority," he added.
Iran has said it opposes an increase in output backed by Gulf producers Saudi Arabia, Kuwait and the UAE.
Venezuela remains opposed.
"We don't see that it is necessary to increase production. We believe the market is in balance," Venezuelan Oil Minister Rafael Ramirez said.
Angola's Oil Minister Jose Botelho de Vasconcelos said he was happy with prices above $100 a barrel.
Kuwait's Oil Minister Mohammad al-Busairi said he was "optimistic" that OPEC would agree to raise output.
Aliabadi arrived in Vienna on Tuesday for the 159th OPEC meeting.
OPEC which pumps some 40 percent of the world's oil last met mid December in Equator where the member states agreed to keep production quota of 24,845,000 barrels a day unchanged.
The International Energy Agency has already called on OPEC to increase output and prevent another damaging spike in prices, with seasonal demand set to strengthen in the coming summer months in the northern hemisphere