The referendum question will read: "Are you in favour of the law ratifying the arbitration agreement between the Government of the Republic of Slovenia and the Government of the Republic of Croatia, which was adopted by the Slovenian Parliament at its session of April 19, 2010, becoming valid?"

Seventy-eight of 82 deputies attending the session voted in favour and none voted against.

Prime Minister Borut Pahor said that rejection of the agreement would be a disastrous mistake for Slovenia, adding that the agreement offered a good solution to the long-standing border dispute and protected Slovenia's vital interests.

The opposition insisted that the agreement was bad for Slovenia because it did not guarantee it direct access to international waters. They said they wanted the Pahor Cabinet to step down if the deal was rejected in the referendum.