The French Polynesian assembly member who quit the ruling coalition now says she will vote for the revised budget.
Sandra Levy-Agami quit the To Tatou Aia coalition ten days ago because of disagreements over the budget.
Her move meant that the ruling coalition lost its one-member majority needed to pass the 2009 budget.
But she has now told the Nouvelles de Tahiti newspaper that there is no question of her allowing the government to fall and that she will support the revised budget.
This comes as top-level talks are planned for later this week in a bid by President Gaston Tong Sang to get opposition support for the budget.
He has said he is ready to do whatever it takes to end the deadlock.
The opposition has called on him to resign - eight months after he came to power following a no-confidence motion.