A battle between beer giants frothed over in federal court Wednesday, with MillerCoors winning a preliminary injunction against rival Anheuser-Busch InBev (BUD) - Get Report  .

MillerCoors had contended that its rival used "false and misleading" advertising to imply its brews include a potentially fattening form of corn syrup.

A federal court judge in Wisconsin ordered Anheuser-Busch to stop using the words "no corn syrup" and an associated icon on its Bud Light packaging.

MillerCoors said that advertising was designed to deceive consumers into thinking that Miller Lite and Coors Light include a fattening form of corn syrup in their final product.

The ruling comes atop a previous federal court injunction that barred Anheuser-Busch from using similar wording in TV ads, billboards, and on its website.

In March, MillerCoors filed a federal lawsuit accusing Anheuser-Busch of spending $30 million on a "false and misleading" ad campaign, according to the Associated Press.

While corn syrup is used in the brewing process, it is not part of the final product, MillerCoors contends. Additionally, consumers also often mistake corn syrup for its calorie-laden cousin, high-fructose corn syrup, notes Craft Brewing Business, a trade magazine.

"Bud Light's campaign was bad for the public, bad for the industry and against the law," said MillerCoors CEO Gavin Hattersley. "With this ruling, we are holding Bud Light accountable for its actions, and we will keep holding their feet to the fire every time they intentionally mislead the American public."

Anheuser-Busch responded with a defiant statement: "Bud Light is brewed with no corn syrup - plain and simple."

"We look forward to defending our right to inform beer drinkers of this fact at trial and on appeal," the company said in a statement.

Shares of Anheuser-Busch InBev rose 0.8% to $94.73. Molson Coors (TAP) - Get Report , parent of MillerCoors, rose 1.4% to $53.13.