diff --git a/pkgs/development/interpreters/python/default.nix b/pkgs/development/interpreters/python/default.nix
index 1ca85603a1fb..af90018870fb 100644
--- a/pkgs/development/interpreters/python/default.nix
+++ b/pkgs/development/interpreters/python/default.nix
@@ -1,5 +1,6 @@
 args:
 args.stdenv.lib.listOfListsToAttrs [
+	[ "default"  (import ./2.4.nix args) ]
 	[ "2.4"  (import ./2.4.nix args) ]
 	[ "2.5" (import ./2.5 args) ]
 ]
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index dc3b0adea320..4dc606cb10bf 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2913,7 +2913,7 @@ rec {
 
   kernelHeaders = kernelHeaders_2_6_23;
 
-  kernelHeaders_2_6_21 = import ../os-specific/linux/kernel-headers/2.6.21.1.nix {
+  kernelHeaders_2_6_21 = import ../os-specific/linux/kernel-headers/2.6.21.3.nix {
     inherit fetchurl stdenv;
   };