Krishnan Saravanan was convicted of the amended charge of failing to disperse from the riot scene in the Little India precinct -- a precinct of Indian businesses, eateries and pubs -- despite being lawfully commanded to do so, The Straits Times reported.
Saravanan is the sixth man to plead guilty to his role in the riot on December 8 last year, which was sparked by the death of an Indian national in a bus accident.
His sentence was backdated to the time of his arrest on December 9 last year. Saravanan was among 25 people charged in relation to the riot to plead guilty.
Five others were sentenced under the same amended charge to serve between 15 and 18 weeks in jail in the last two months. Cases against the remaining 19 charged with rioting are pending in court.
Some 400 migrant workers from South Asia rioted following the fatal accident, injuring 49 police and Home Team officers and damaging 23 emergency vehicles.