This study examined if pre-intervention maternal gender role beliefs predict change in sexual communication in a sexual risk behavior prevention program designed to increase parent--pre-adolescent communication about sex. A sample of 281 African American fourth and fifth graders and their mothers participated in the five-session program and completed computerized questionnaires at baseline, postintervention, and 6-month follow-up. Based on mother report, more egalitarian maternal gender role beliefs predicted greater increases in parent--pre-adolescent communication about sex at postintervention. Based on pre-adolescent report, similar findings emerged at the 6-month follow-up, but only for boys. The relationship of maternal gender role beliefs to changes in sexual communication was not accounted for by maternal comfort with sexual communication with their pre-adolescents. The implications of maternal gender role beliefs in a prevention program designed to increase communication about sexual topics are considered. (Contains 2 tables.)