The leu opened at 4.323/4.325 against the euro, compared to 4.3265/4.329 at closing the day before.
Later, the leu started to strengthen slightly and, at around 10:00 local time, it was trading at 4.317/4.320 against the European coin.
The central bank published Wednesday a leu-to-euro reference of 4.321 units, the weakest level in 15 months.
On the money market, overnight rates dipped to 5%-5.5% a year, from 5.33%-5.83% a year previously.