A correction to the quartic hilltop inflationary model is proposed to account for stabilizing terms in the potential. We derive analytical predictions for the spectral index
n
s
and tensor-scalar ratio
r
which lie within the Planck 2018 survey bounds. The reheating predictions of the corrected model are investigated and by considering the reheating temperature we further constrain the
(
n
s
,
r
)
parameter space. It is shown that the correction terms are physically important during inflation and generally need to be accounted for when considering hilltop models as a candidate for inflation.