diff --git a/pkgs/development/interpreters/python/2.5/default.nix b/pkgs/development/interpreters/python/2.5/default.nix
index 326e93ea5691..e74ddf2214c1 100644
--- a/pkgs/development/interpreters/python/2.5/default.nix
+++ b/pkgs/development/interpreters/python/2.5/default.nix
@@ -75,5 +75,9 @@ stdenv.mkDerivation ( {
     opensslSupport = openssl != null;
     tkSupport = (tk != null) && (tcl != null);
     libPrefix = "python2.5";
+
+    # List of supported platforms.
+    #  - On Darwin, `python.exe' fails with "Bus Error".
+    platforms = stdenv.lib.platforms.allBut "i686-darwin";
   } ;
 } // (if stdenv.system == "i686-darwin" then { NIX_CFLAGS_COMPILE = "-msse2" ; patches = [./search-path.patch ./nolongdouble.patch]; } else {} ) )