diff --git a/pkgs/development/haskell-modules/configuration-ghc-9.2.x.nix b/pkgs/development/haskell-modules/configuration-ghc-9.2.x.nix
index 0cebab8f4b8c..7dd63c579934 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-9.2.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-9.2.x.nix
@@ -169,9 +169,6 @@ self: super: {
   # lens >= 5.1 supports 9.2.1
   lens = doDistribute self.lens_5_2;
 
-  # Syntax error in tests fixed in https://github.com/simonmar/alex/commit/84b29475e057ef744f32a94bc0d3954b84160760
-  alex = dontCheck super.alex;
-
   # Apply patches from head.hackage.
   language-haskell-extract = appendPatch (pkgs.fetchpatch {
     url = "https://gitlab.haskell.org/ghc/head.hackage/-/raw/dfd024c9a336c752288ec35879017a43bd7e85a0/patches/language-haskell-extract-0.2.4.patch";