Popular Irish brewer Guinness has elected to change its 256-year-old recipe to make the beer acceptable to vegetarian and vegan drinkers. Its creamy stout will now be brewed without the help of isinglass, a gelatin made from fish bladders used to filter out yeast particles from the finished beer.

“Isinglass has been used widely within the brewing industry as a means of filtration for decades,” the company said in a statement, according to CNN Money. “However, because of its use we could not label Guinness as suitable for vegetarians and have been looking for an alternative solution for some time.”

The actual ingredients of the beer — hops, barley, yeast, and water — are vegetarian, but traces of fish bladder can end up in the beer sometimes. The company is in the process of installing a new filtration system at their flagship brewery at St. James’s Gate in Ireland. Guinness plans to have the new process running by late 2016, with the vegan-friendly brew on shelves not long after, according to CNBC.

The decision comes after several online petitions, which have asked Guinness to go vegan by using alternative agents to isinglass. The company currently sells products in more than 150 countries, but opening their products up to a vegan audience could increase sales to a new market.