Eurozone inflation failed to pick up in November - ahead of Mario Draghi's QE boost
Analysts were expecting CPI to have risen by 0.2% year-on-year, up from 0.1% in October.
Core consumer prices rose by 0.9%, less than last month's figure and less than was forecast.
Core prices are an important measure because they strip out the most volatile items - things like fuel and food prices which are subject to massive variations.
A large part of the eurozone's extremely low inflation right now is down to the slump in the price of oil over the last year - but the core figure shows that other prices aren't rising by as much as the ECB would like, either.
Analysts had expected core prices to rise by 1%, down from 1.1% in October.
ECB chief Mario Draghi is gearing up to announce more easing measures after Thursday's policy meeting. That seems likely to mean a bigger quantitative easing (QE) programme, and possibly more interest rate cuts - which would push the eurozone deposit rate even further into negative territory.