diff --git a/liberty-master.nix b/liberty-master.nix
index e7dd7ab..88a12b0 100644
--- a/liberty-master.nix
+++ b/liberty-master.nix
@@ -12,6 +12,8 @@ pkgs.stdenv.mkDerivation rec {
 
 		go
 		nodejs
+	] ++ lib.optionals stdenv.isDarwin [
+		# This was broken on Linux.
 		swift
 	];