(Bloomberg) -- Willis Group Holdings Plc, the third-largest insurance broker, agreed to better terms for Towers Watson & Co. shareholders in a proposed merger after the consulting firm’s investors said that a June agreement was inadequate.

The one-time cash dividend will be $10 a share, compared with $4.87 under the previous offer, Towers Watson said in a statement Thursday. The latest agreement values the consulting firm at about $8.9 billion, based on Wednesday’s closing price for Willis.

The consulting firm had postponed a shareholder vote that was scheduled for Nov. 18 amid opposition from some proxy- advisory firms and investors to the deal, which was valued at about $8.7 billion when it was announced on June 30. Towers Watson shares fell 8.8% that day, and investor Driehaus Capital Management LLC later faulted the accord as a “takeunder.” A vote on the new terms will occur by Dec. 16, Arlington, Virginia-based Towers Watson said.

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