The F1 drivers' union has missed an opportunity to demonstrate its power, according to Timo Glock.
The Virgin driver was among 19 of his colleagues to sign a document organised by Grand Prix Drivers' Association chairman Rubens Barrichello asking the FIA to totally ban the 'DRS' overtaking system this weekend.
Ultimately, the FIA agreed to ban the use of the wing flap in the tunnel, but Glock told Auto Motor und Sport he is worried the compromise is akin to a backdown.
"I don't know if we will still be taken seriously," he said.
Many of the group of 19 are upset with the likes of Lewis Hamilton and Michael Schumacher, who refused to sign the document.
It is believed Nico Rosberg, Nick Heidfeld and Vitaly Petrov also refused to sign.
Barrichello however insists he can "live with" the compromise because the FIA at least agreed to ban DRS in the tunnel.
"The rest is fine -- we should try to see what it (DRS) brings to the event," said the Brazilian.
Sebastian Vettel agreed it is a "decent compromise. The tunnel was our biggest concern," he said.