That is the claim of Bild newspaper in Germany, despite team chiefs Christian Horner and Adrian Newey saying a decision about the energy-recovery technology at Sepang will only be taken after it is tested on Friday.
The report said the team only decided to "voluntarily" do without KERS in Australia because it would only have been an additional reliability worry on board the clearly dominant RB7.
"We tested the system in practice but we were quick enough in Australia without having to use it," said team consultant Helmut Marko.
"In Malaysia, however, we want to use it."
Bild said the advantage of KERS on Sepang's two 1km straights is up to half a second per lap, and will be particularly useful on the 700 metre run to the first corner at the start.