Uh oh.

The International Monetary Fund said Spain must step up efforts to reform its economy as Europe’s sovereign debt crisis threatens to damp growth.

“The repair of the economy is incomplete and risks are considerable,” the Washington-based IMF said in its annual appraisal of Spain yesterday. There must be “no let up in the reform momentum” to bolster the recovery and reduce a 21 percent unemployment rate that is “unacceptably high,” the fund said.

Spain’s Socialist government is carrying out the deepest budget cuts in at least three decades while raising the retirement age and reducing firing costs. Prime Minister Jose Luis Rodriguez Zapatero overhauled wage-bargaining rules on June 10 in the latest step aimed at reining in borrowing costs that surged to the highest in a decade last week on mounting expectations of a Greek default.