British Prime Minister Theresa May has had her hopes of getting her Brexit deal passed before the March 29th deadline dashed.

The Speaker of the UK Parliament John Bercow announced that he would not allow a third vote on May’s Brexit deal unless it undergoes substantial change, citing parliamentary rules dating back to 1604.

The ruling all but confirms that May will have to seek an extension to the deal as any major change would have to gain approval from the EU before being tabled in British Parliament.