diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 1493043d1c7..eac05e5125d 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7006,7 +7006,7 @@ in
 
   haskell = callPackage ./haskell-packages.nix { };
 
-  haskellPackages = haskell.packages.ghc844.override {
+  haskellPackages = haskell.packages.ghc863.override {
     overrides = config.haskellPackageOverrides or haskell.packageOverrides;
   };