diff --git a/pkgs/development/interpreters/python/2.5/default.nix b/pkgs/development/interpreters/python/2.5/default.nix
index 9a84bfa7ff8..161584ee707 100644
--- a/pkgs/development/interpreters/python/2.5/default.nix
+++ b/pkgs/development/interpreters/python/2.5/default.nix
@@ -30,7 +30,7 @@ stdenv.mkDerivation {
   C_INCLUDE_PATH = concatStringsSep ":" (map (p: "${p}/include") buildInputs);
   LIBRARY_PATH = concatStringsSep ":" (map (p: "${p}/lib") buildInputs);
   
-  configureFlags = "--enable-shared";
+  configureFlags = "--enable-shared --with-wctype-functions";
   
   preConfigure = "
     # Purity.