This Bud’s not for you: Anheuser-Busch claims Heineken ripped off its design for a new kind of keg.

The Budweiser maker is suing its Dutch competitor over Heineken’s Brewlock tap system, claiming it infringes on a patented design that only Anheuser-Busch InBev was able to innovate.

Traditional stainless steel kegs use gas to force the liquid out of the container. The gas can impact the quality of the suds, so various companies had been trying to build a better keg — “but only ABI’s research and development team was able to truly innovate in this area,” Anheuser-Busch said in Manhattan federal court papers.

The new design features a keg created from a particular kind of resin instead of steel, making it lighter, and features a bag inside to hold the liquid. A pressurized gas is put between the interior of the keg and the bag, forcing the beer out without the gas ever coming in contact with the brew.

Heineken approached Anheuser-Busch about the design but the two companies never made a deal for its use before Heineken’s Brewlock was introduced in 2015, according to the lawsuit.

“Heineken does not agree with ABI’s claims and we are confident in the merits of our case,” the beer maker said in a statement.