Research shows that gambling is a popular activity among youth. The more young people become involved in these activities, the more likely they are to develop irrational thoughts and habits related to gambling. In this study, 273 French-speaking students in grades 5 and 6 helped to test a video designed to (a) increase knowledge about gambling and (b) correct inaccurate knowledge. The effectiveness of the video was evaluated using two experimental conditions and one control condition. Analysis indicated that the video significantly increased gambling knowledge and decreased errors in attitudes toward gambling. The implications of these results for the prevention of gambling problems are discussed.