Using a sticker search task, Gentner and Rattermann ("Perspectives on thought and language: Interrelations in development" (Gelman & Byrnes, Eds.), pp. 225-227, 1991) found that the ability to ignore surface features and match objects in terms of relative size emerged around 5 years of age. However, because spatial position covaried with relative size, it was unclear which of these relations successful children used. To find out, we tested 5-year-olds with the same sticker search task, but manipulated spatial position. Children performed significantly worse, though not randomly, when they were prevented from using spatial position to find the sticker. This finding suggests that children use spatial position when they can, but are capable of using relative size if they must.