The debt agency said it sold the 0.90% June 2019 bond at -0.038%, compared with 0.139% when the bond was last auctioned in June.

The other bond sold, the 1.25% April 2033 bond sold at a yield of 0.255%. It was last sold in March, at 0.868%.

The sale brings to 24.4 billion euros the total that double-A rated Belgium has sold to date. It has a target for the year of 28 billion euros and still has two auctions planned, in September and in November.