"Human prosociality is a valuable but also deeply puzzling trait. While several studies suggest that prosociality is an impulsive behavior, others argue that self-control is necessary to develop prosocial behaviors. Yet, prosociality and self-control in children have rarely been studied jointly. Here, we measured self-control (i.e., delay-of-gratification) and prosociality (i.e., giving in a dictator game) in 250 4- to 6-year-old French schoolchildren. Contrary to previous studies, we found a negative relationship between waiting in the delay-of-gratification task and giving in the dictator game. The effect was especially pronounced when the partner in the dictator game was unknown compared with giving in a dictator game where the partner was a friend. Our results suggest that self-control is not always necessary to act prosocially. Future studies investigating whether and how such pattern develops across the lifespan and across cultures are warranted."