The VLA correlator is a digital device, which causes a small but noticeable error in the calculation of the correlation coefficient when this coefficient is high. A recent change to the AIPS program FILLM now enables an approximate correction of this error when observations are taken in the continuum mode. Users may wish to apply this correction (commonly known as the `Van Vleck' correction) when observing relatively unresolved objects with flux densities exceeding about 100 Jy (depending on band). Unfortunately, no correction for this effect for data taken in the spectral line modes is yet available.