diff --git a/pkgs/development/interpreters/perl-5.10/default.nix b/pkgs/development/interpreters/perl-5.10/default.nix
index 442f428ac6f4..9e745ae18141 100644
--- a/pkgs/development/interpreters/perl-5.10/default.nix
+++ b/pkgs/development/interpreters/perl-5.10/default.nix
@@ -46,7 +46,7 @@ stdenv.mkDerivation {
   preBuild =
     ''
       # Make Cwd work on NixOS (where we don't have a /bin/pwd).
-      ${if stdenv.system == "i686-darwin" then "" else "substituteInPlace lib/Cwd.pm --replace \"'/bin/pwd'\" \"'$(type -tP pwd)'\""}
+      ${if stdenv.isDarwin then "" else "substituteInPlace lib/Cwd.pm --replace \"'/bin/pwd'\" \"'$(type -tP pwd)'\""}
     '';
 
   setupHook = ./setup-hook.sh;