Communication deficits are one of the main characteristics of autism spectrum disorder (ASD). Self-injurious behavior (SIB) in individuals with ASDs often occurs due to the individuals' lack of social-communicative abilities to express what they want (e.g., attention; access to tangible items; help). Many researchers have successfully used functional communication training (FCT) to replace SIB with positive communicative responses for children with ASD. While these studies have reported positive outcomes, there is limited research examining the extent to which the individuals will maintain the gains of the treatment after treatment is discontinued. Thus, this study aimed to investigate the impacts of FCT on socially appropriate behavior of children with ASD and the extent to which the gains would be maintained after withdrawal of treatment. FCT procedures were implemented to increase functional communication responses by asking for a break while limiting SIBs expressed by the participants when confronted with non-preferred activities (e.g., academic tasks). This study revealed that combining FCT with concurrent schedules instead of extinction effectively maintained low rates of SIBs while simultaneously increasing the opportunity for participants to emit alternative communicative responses over time.