diff --git a/pkgs/development/compilers/ghc/head.nix b/pkgs/development/compilers/ghc/head.nix
index 98a01491237..3e30cd9b72b 100644
--- a/pkgs/development/compilers/ghc/head.nix
+++ b/pkgs/development/compilers/ghc/head.nix
@@ -1,7 +1,7 @@
 {stdenv, fetchurl, ghc, perl, gmp, ncurses}:
 
 stdenv.mkDerivation rec {
-  version = "7.3.20110804";
+  version = "7.3.20110825";
 
   name = "ghc-${version}";
 
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "${homepage}/dist/current/dist/${name}-src.tar.bz2";
-    sha256 = "1n0prny5aaq09jp83skixla8frz5hcn8jbrc61m428q12jq1xsm7";
+    sha256 = "06ngp3blg1nb1akiyxx2iypiwmybw4jg67lk9nmsn1jmj41v7dsm";
   };
 
   buildInputs = [ghc perl gmp ncurses];
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 4531c54a4be..19adc62dff7 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2166,7 +2166,7 @@ let
         (if stdenv.isDarwin then ghc704Binary else ghc6121Binary)
         (x : x.ghc721Prefs) false false lowPrio);
 
-  # Still a release candidate.
+  # Reasonably current HEAD snapshot. Should *always* be lowPrio.
   haskellPackages_ghcHEAD =
     haskellPackagesFun ../development/compilers/ghc/head.nix
       ghc6121Binary (x : x.ghcHEADPrefs) false false lowPrio;