diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 42cb2f4cb83..230bc3aec32 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -956,6 +956,10 @@ rec {
     inherit fetchurl stdenv zlib bzip2;
   };
 
+  python25 = import ../development/interpreters/python/2.5 {
+    inherit fetchurl stdenv zlib bzip2;
+  };
+
   realPerl = import ../development/interpreters/perl {
     inherit fetchurl stdenv;
   };