  We point out that the prediction of the minimal chaotic inflation model is
altered if a scalar field takes a large field value close to the Planck scale
during inflation due to a negative Hubble induced mass. In particular, we show
that the inflaton potential is effectively suppressed at a large inflaton field
value in the presence of such a scalar field. The scalar field may be
identified with the standard model Higgs field or flat directions in
supersymmetric theory. With such spontaneous suppression, we find that the
minimal chaotic inflation model, especially the model with a quadratic
potential, is consistent with recent observations of the cosmic microwave
background fluctuation without modifying the inflation model itself.
