At the 1924 Olympics in Paris Rastas represented Finland in both the 5000 m and the cross-country race, the latter again doubling as a team competition. The 5000 m was held first; Rastas won his heat and placed 11th in the final. The conditions for the cross-country race were extremely hot and demanding, and the majority of runners failed to finish; this included Rastas, who dropped out shortly after the halfway point. Two other Finns (Väinö Sipilä and Eero Berg) also dropped out, but Finland still won the team race again.