diff --git a/Cabal-syntax/src/Language/Haskell/Extension.hs b/Cabal-syntax/src/Language/Haskell/Extension.hs
index d5fb797eea6..8eac9c0de5d 100644
--- a/Cabal-syntax/src/Language/Haskell/Extension.hs
+++ b/Cabal-syntax/src/Language/Haskell/Extension.hs
@@ -54,6 +54,8 @@ data Language
   | -- | The GHC2021 collection of language extensions.
     -- <https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0380-ghc2021.rst>
     GHC2021
+  | -- | The GHC2024 collection of language extensions.
+    GHC2024
   | -- | An unknown language, identified by its name.
     UnknownLanguage String
   deriving (Generic, Show, Read, Eq, Ord, Typeable, Data)