  The persistent gamma-ray source 4FGL J0647.7-4418 is tentatively associated
in the latest Fermi catalogue with the sub-dwarf O-type X-ray binary HD 49798.
However, an AGN candidate is also mentioned as an alternative identification in
updated versions of the catalogue accompanying paper. If the first association
were correct, this would add HD 49798 to the handful of currently known
gamma-ray binaries and, therefore, represent a significant breakthrough not
only because of a new member addition, but also because of the apparent white
dwarf companion in this system. Despite these perspectives, here we show that
the stellar association is likely wrong and that the proposed AGN object, well
inside the Fermi 95% confidence ellipse, is a more conceivable counterpart
candidate to the Fermi source due to its strong blazar similarities.
