The International Labour Organisation closed a formal complaint procedure that was opened three years ago "concerning non-observance by Qatar of the Forced Labour Convention."
Praising Qatar's commitment "to ensuring fundamental principles and rights at work for all workers and the resulting breakthrough to end the 'kafala' sponsorship system," the ILO's Governing Body said it would monitor progress for three years.
Reported abuses under "kafala," which binds workers to their employer, include unpaid wages, seizing migrant workers' passports, and denying the right to unionise.
The complaint process, opened in 2014, put pressure on Qatar to reform.
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"It originated out of deep concern for exploitative practices," ILO Workers' Group spokeswoman Catelene Passchier said today, stressing that Qatar must act on its promises.
"We emphasise that nice words, and nice and good intentions, are not sufficient."
Qatar relies heavily on a massive workforce of about two million migrant workers from Asia to expand its infrastructure.
Winning the hosting rights for the soccer tournament in December 2010 exposed Qatar to criticism of employment practices that are common in the Gulf region, and labour protection laws that fell short of international standards.
ILO Employers' Group spokesman Mthunzi Mdwaba said today's decision was "a clear case of progress and a milestone we must celebrate."
"There is never any beauty without pain," Mdwaba said. "It is all worth it in the end.