Bethesda doesn’t seem very happy, Sony.

The developer revealed on its site that the PlayStation 4 maker will not allow user-created mods on its console for Fallout 4 or The Elder Scrolls V: Skyrim Special Edition. Mods became available on the Xbox One when they launched for Fallout 4 in May.

“After months of discussion with Sony, we regret to say that while we have long been ready to offer mod support on PlayStation 4, Sony has informed us they will not approve user mods the way they should work: where users can do anything they want for either Fallout 4 or Skyrim Special Edition,” Bethesda noted on its site.

“Like you, we are disappointed by Sony’s decision given the considerable time and effort we have put into this project, and the amount of time our fans have waited for mod support to arrive,” Bethesda continued. “We consider this an important initiative, and we hope to find other ways user mods can be available for our PlayStation audience. However, until Sony will allow us to offer proper mod support for PS4, that content for Fallout 4 and Skyrim on PlayStation 4 will not be available.”

User mods have been a part of the PC gaming scene for decades, but they’ve been traditionally unavailable on console until Microsoft allowed players to download Fallout 4 mods on the Xbox One. Sony, however, doesn’t seem as ready for change.