diff --git a/lib/systems/parse.nix b/lib/systems/parse.nix
index 6eb4f27cc5194..34bfd94b3ce50 100644
--- a/lib/systems/parse.nix
+++ b/lib/systems/parse.nix
@@ -221,6 +221,8 @@ rec {
   vendors = setTypes types.openVendor {
     apple = {};
     pc = {};
+    knuth = {};
+
     # Actually matters, unlocking some MinGW-w64-specific options in GCC. See
     # bottom of https://sourceforge.net/p/mingw-w64/wiki2/Unicode%20apps/
     w64 = {};