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-rw-r--r--pkgs/top-level/release-haskell.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/top-level/release-haskell.nix b/pkgs/top-level/release-haskell.nix
index 36a5835c9cd01..87a08dddb606b 100644
--- a/pkgs/top-level/release-haskell.nix
+++ b/pkgs/top-level/release-haskell.nix
@@ -222,6 +222,7 @@ let
       # working as expected.
       cabal-install = all;
       Cabal_3_4_0_0 = with compilerNames; [ ghc884 ghc8104 ];
+      cabal2nix-unstable = all;
       funcmp = all;
       # Doesn't currently work on ghc-9.0:
       # https://github.com/haskell/haskell-language-server/issues/297