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-rw-r--r--pkgs/top-level/haskell-defaults.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/top-level/haskell-defaults.nix b/pkgs/top-level/haskell-defaults.nix
index 38d4774ce13..a81f8cae90a 100644
--- a/pkgs/top-level/haskell-defaults.nix
+++ b/pkgs/top-level/haskell-defaults.nix
@@ -209,8 +209,8 @@
                ghcBinary = pkgs.haskellPackages.ghcPlain;
                prefFun = ghcHEADPrefs;
                extraArgs = {
-                 happy = pkgs.haskellPackages.happy_1_19_2;
-                 alex = pkgs.haskellPackages.alex_3_1_3;
+                 happy = pkgs.haskellPackages.happy;
+                 alex = pkgs.haskellPackages.alex;
                };
              };