diff --git a/pkgs/top-level/haskell-defaults.nix b/pkgs/top-level/haskell-defaults.nix
index f566270d3df..d09d34dbf6d 100644
--- a/pkgs/top-level/haskell-defaults.nix
+++ b/pkgs/top-level/haskell-defaults.nix
@@ -249,7 +249,7 @@
   packages_ghc742 =
     packages { ghcPath = ../development/compilers/ghc/7.4.2.nix;
                ghcBinary = ghc6121BinaryDarwin;
-               prefFun = ghcHEADPrefs;
+               prefFun = ghc741Prefs;
              };
 
   # Reasonably current HEAD snapshot. Should *always* be lowPrio.