A Brooklyn bodega worker who used his cellphone to film his boss lighting a homeless man on fire was sentenced Friday to 15 years in prison.

Lorenzo Fonerin, 23, was convicted of assault in March for standing by as Suliman Ahmed doused Tasheen Hand, 38, with lighter fluid while the mentally ill man slept on a sidewalk in East New York on Sept. 3, 2012.

Ahmed allegedly kicked a flaming book of matches onto Hand’s back while Fonerin shouted encouragement, the video shows.

Hand was burned over 30 percent of his body.

Ahmed’s trial is pending.