  We demonstrate that the linearized Einstein gravity in de Sitter (dS)
spacetime besides the evident symmetries also possesses the additional (local)
symmetry $h_{\mu\nu}\rightarrow h_{\mu\nu} + {\cal E}_{\mu\nu}\chi$, where
${\cal E}_{\mu\nu}$ is a spin-two projector tensor and $\chi$ is an arbitrary
constant function. We argue that an anomalous symmetry associated with this
hitherto `hidden' property of the existing physics is indeed at the origin of
`dS breaking' in linearized quantum gravity.
