Luxembourg began wheeling the EU out of the emergency room on Sunday when its citizens voted Yes to the constitution in a referendum.
There had never been much doubt the EU founder member could have voted No, even if pre-vote polls said the result would be close.
In the end it was a healthy majority, over 10 percentage points to the good for the Yes camp in the electorate of just over 200,000 people.
For Prime Minister Jean-Claude Juncker it was a relief, as he had promised to resign should the referendum fail.
“I would like to praise the Luxembourg voters who said Yes. It took courage after the double French and Dutch No. Europe is still in crisis, but in a crisis that allows us to look in a more optimistic direction”, he said.
Luxembourg is the 13th member state to ratify the constitution, but the first by referendum since the French and Dutch shocks.