This was the first sale ever with such a maturity, according to ministry data.
Banks offered RON1.48 billion, but the ministry rejected all yields above 7.45% a year.
The ministry plans to sell debt worth RON4.2 billion in October, up from RON3.13 billion sold a month earlier.
So far this year, Romania sold around RON42.6 billion (EUR9.8 billion) in leu-denominated state notes. Additionally, two foreign currency bond auctions have brought the ministry EUR1.4 billion, while an international debt sale early June raised EUR1.5 billion. (EUR1=RON4.3329)