A federal judge ruled Thursday that Google acted illegally as a monopoly over the online advertising industry. 

Judge Leonie Brinkema from the U.S. District Court for the Eastern District of Virginia said that the company broke the law when it built its dominance over the technology that places advertisements on pages across the web. The ruling marks the second time in less than a year that Google has been found to be in violation of antitrust laws.

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Brinkema said Google maintains a monopoly over two markets in the online advertising industry.

“For over a decade, Google has tied its publisher ad server and ad exchange together through contractual policies and technological integration, which enabled the company to establish and protect its monopoly power in these two markets,” Brinkema wrote in a 115-page ruling. 

“In addition to depriving rivals of the ability to compete, this exclusionary conduct substantially harmed Google’s publisher customers, the competitive process, and, ultimately, consumers of information on the open web,” she said.

Last year, the Justice Department and a group of states sued Google, arguing that the tech giant held a monopoly in ad technology, allowing the company to charge higher prices while taking a larger portion of each sale. The Justice Department also preemptively asked the court to force the tech giant to sell some pieces of its ad technology business acquired over the years, like Google Chrome.

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In August, a separate judge found Google illegally maintained a monopoly over online searches. The two rulings could result in a sweeping overhaul of the company, which is facing major restructuring. 

Next week, Google will appear again in court to argue against the Justice Department’s proposal to force it to divest from its Chrome browser.