Amazon said it would appeal a €1.1 billion fine from Italy after antitrust investigators found the online shopping giant had given unfair preference to sellers who also ship their goods through Amazon’s logistics service.

Amazon had previously tried to halt the case in Italy on the grounds that it is facing a parallel investigation in Brussels covering the same ground. Its attempt was dismissed in November by the European General Court in Luxembourg.

On Thursday, Italy’s competition regulator said Amazon had been more lenient in applying performance criteria, which can lead in extreme cases to merchants being suspended, if sellers were also paying for Amazon to ship their parcels.