A 15-year-old boy was fighting for his life after being shot in the back on a Brooklyn street Monday afternoon, police said.

The teenager was struck on 62nd Street near 20th Avenue in Bensonhurst around 1 p.m., according to cops.

Police sources said the shooting broke out during an argument.

EMS rushed the boy to Maimonides Medical Center, where he was listed in critical condition, police said.