Asch's line judgement task was used to compare the susceptibility to social influence of adults with Asperger's syndrome with that of two groups of controls one of which was matched on verbal IQ. There was no overall difference between the three groups' mean rate of conformity but in contrast to both groups of controls, the subjects with Asperger's syndrome were significantly more likely to adopt a consistently conforming or nonconforming strategy. There were also significant differences between the groups in their interaction with the other participants. The implications of the findings are discussed in the context of current theories of autistic social dysfunction.