Based on three years of Fermi Large Area Telescope (LAT) gamma-ray data of the Virgo cluster, evidence for an extended emission associated with dark matter pair annihilation has been reported (Han et al. 2012). After an in depth spatial and temporal analysis, we argue that this signal is mainly due to the appearance of a population of previously unresolved gamma-ray point sources in the region of interest that were not part of the LAT second source catalog.