Studies indicate that rumination might play a role in obsessive–compulsive disorder. In a previous experimental study, rumination about an unwanted intrusive thought (UIT) maintained the urge to neutralize this thought. We sought to replicate and extend these findings with measures of behavioral and mental neutralizing. Additionally, we investigated possible mechanisms that might be involved in the effects of rumination on the UIT. We activated a UIT by asking students ( N = 105) to write down a sentence stating that they wished a loved person would die in a car accident. Participants were randomly allocated to rumination about the UIT, rumination about negative mood, or distraction. As predicted, rumination about the UIT maintained the urge to neutralize the UIT, relative to rumination about negative mood and distraction. In addition, rumination about the UIT also maintained distress associated with the UIT compared to rumination about negative mood and distraction. The effects of rumination did not extend to behavioral or mental neutralizing. UIT frequency and vividness were unaffected by rumination. The present findings strengthen the confidence that rumination contributes to the maintenance of UITs.