diff --git a/pkgs/lib/platforms.nix b/pkgs/lib/platforms.nix
index a34b8eb297d1..d8f9692ae094 100644
--- a/pkgs/lib/platforms.nix
+++ b/pkgs/lib/platforms.nix
@@ -3,7 +3,7 @@ let lists = import ./lists.nix; in
 rec {
   gnu = linux; /* ++ hurd ++ kfreebsd ++ ... */
   linux = ["i686-linux" "x86_64-linux" "powerpc-linux"];
-  darwin = ["i686-darwin" "powerpc-darwin"];
+  darwin = ["i686-darwin" "powerpc-darwin" "x86_64-darwin"];
   freebsd = ["i686-freebsd" "x86_64-freebsd" "powerpc-freebsd"];
   openbsd = ["i686-openbsd" "x86_64-openbsd"];
   netbsd = ["i686-netbsd" "x86_64-netbsd"];