Banks offered RON1.56 billion, central bank data showed.
At the most recent similar auction in April, the ministry sold RON1 billion in one-year paper at an average yield of 2.94%.
The ministry sold state treasuries worth RON3.48 billion in May, slightly up from the initial target of RON3.44 billion. The institution had to repay debt worth RON2.08 billion this month.
So far in 2014, Romania sold RON20.91 billion in leu-denominated notes and EUR678.7 million at three euro-denominated auctions on the local market.
The ministry also tapped international markets for $2 billion at a two-part U.S. dollar bond issue in January, and raised EUR1.25 billion in a ten-year Eurobond sale last month. (EUR1=RON4.4099)