This Article analyses the judgment of the Court of Justice of the European Union of 3 October 2019 (case C-285/18). This judgment plays an important role in the interpretation of the public procurement rules in the countries of the European Union. In particular, in those countries that have implemented the EU rules on the in-house procurement, while at the same time introducing restrictions compared to the EU rules. Current Polish regulations on in-house procurement in this area are also discussed.