Activist investor Bill Ackman will be able to vote his Allergan shares at a special shareholders meeting on Dec. 18 if he makes additional disclosures by Nov. 7, a California federal judge ruled Tuesday.

Allergan sued Ackman and Valeant, which launched a $55 billion takeover of the botox maker, to stop Ackman from voting the 9.7 percent of Allergan stock he owns.

At the meeting, shareholders will vote on a new slate of directors, who Valeant and Ackman hope will consider their bid.

Judge David Carter said he didn’t think stopping the vote was an “appropriate remedy” for Allergan’s insider trading claims.

Allergan said it would file for an emergency appeal.