Audiovisual integration is a vital process that enables the creation of meaningful multimodal percepts. Previous evidence suggests that the right inferior parietal lobule plays a central role in audiovisual temporal integration; however, this role has not been explored by directly manipulating cortical activity. We employed the well-known sound-induced flash illusion, in which a single visual flash, when accompanied by two auditory tones, is misperceived as multiple flashes. Following administration of repetitive transcranial magnetic stimulation to the right angular gyrus, there was a significant decrease in the number of perceived flashes when single visual stimuli were presented with pairs of tones, reflecting a reduction in susceptibility to the illusion and an increase in perceptual accuracy. Stimulation of the right supramarginal gyrus did not affect the illusion. Perturbation of neural networks involved in multisensory temporal integration can induce changes in audiovisual processing resulting in a more veridical representation of audiovisual events. These data suggest that cross-modal binding is an active process in which the delineation of coherent entities in the environment takes precedence over temporal precision.