In the future, the AfD can also be led by just one chairman.
At the federal party conference in Riesa, Saxony, a motion to change the AfD statutes, according to which a single leader should also be possible, received the necessary two-thirds majority.
348 out of 506 delegates voted in favor of the change.
The previously valid statutes provided for "two or three" federal spokesmen - that's the name of the chairmen in the AfD.
The Hessian member of the Bundestag, Albrecht Glaser, spoke out against the change during the debate.
He said: "As a radical democratic party, this party does not need the one-man or one-woman principle." The Thuringian state leader and party right-wing extremist Björn Höcke campaigned for the reform, although the dual leadership worked for him in Thuringia.
"Basically, two-pointers are prone to conflict," he said in the debate.
At the meeting in Riesa, the AfD delegates determine a new party leadership.
It was initially unclear whether the new regulation would be applied this time.
The incumbent party leader Tino Chrupalla, who has led the AfD alone since the departure of ex-co-boss Jörg Meuthen in recent months, is applying for a new term.