A Czech court rejected a legal challenge to the Lisbon Treaty Tuesday, paving the way for its adoption in the country, observers said.

The court case, brought by conservative lawmakers who contended the EU treaty wasn't compatible with national laws, was the last roadblock standing in the way of its ratification by Czech President Vaclav Klaus, the EUobserver reported.

Pavel Rychetsky, the court's chief justice, told state-run TV he had determined the treaty "is not in conflict with the constitutional law of the Czech Republic."

The country is the last EU member state to fully ratify the treaty, which must have the approval of all members to put its provisions into effect. The process had been held up by Klaus, a strong Euroskeptic and opponent of the strengthened EU authority that Lisbon would bring.

The EUobserver said Klaus climbed down from his opposition last week by offering to sign the accord if the Czech Republic was given the power to opt out of the requirements of the treaty's human rights charter.