The logo of the Organization of the Petroleum Exporting Countries (OPEC) is pictured at its headquarters in Vienna, Austria, March 21, 2016.

OPEC on Wednesday pointed to a small deficit in the oil market next year due to restraint by Saudi Arabia even before the latest supply pact with other producers takes effect, suggesting a tighter market than previously thought.

In a monthly report, OPEC said demand for its crude will average 29.58 million barrels per day (bpd) next year. That points to a 30,000 bpd deficit if OPEC keeps pumping at November's rate. Previous reports had suggested a surplus.