A Delaware judge has ordered Bill Koch and his Oxbow Carbon energy firm to post a nearly $88 million bond before appealing a Delaware Court of Chancery decision to force the company’s sale in order to compensate minority investors that were denied their right to a buyout in 2016.

Vice Chancellor J. Travis Laster on Wednesday granted the request from Crestview Partners and Load Line Capital, which had argued the bond was necessary to protect their interests while Oxbow appeals the case to the Delaware Supreme Court.