Nurettin Demirtas, 35, was arrested in December as part of a nationwide probe into a network of doctors and middlemen who provide false medical reports declaring draft evaders unfit for military service.

He was at the time chairman of the Democratic Society Party (DTP), which holds 21 parliamentary seats.

The military court in Ankara ruled Thursday that a 2006 medical report that diagnosed Demirtas with lung tuberculosis was false, Anatolia reported.

An earlier medical examination had declared him fit for military service.

He was drafted in April, immediately after he was released by the court pending trial.

He will now serve his jail sentence after completing his 15-month military service.

Demirtas, a Kurdish hardliner who had earlier served time for collaborating with the rebel Kurdistan Workers' Party (PKK), was arrested on December 17, shortly after being elected DTP chairman.

Last weekend the DTP elected Ahmet Turk, a veteran Kurdish politician known as a dovish figure, as its new chairman.

The DTP itself is currently on trial at the Constitutional Court for alleged links to the PKK, listed as a terrorist group by Ankara and much of the international community, and faces the risk of being outlawed.