diff --git a/etc/xo/subsystem-list b/etc/xo/subsystem-list
index 48473e50..6568ccbc 100644
--- a/etc/xo/subsystem-list
+++ b/etc/xo/subsystem-list
@@ -19,6 +19,7 @@ xo-gc
 xo-type
 xo-procedure2
 xo-numeric
+xo-tokenizer2
 xo-allocutil
 xo-alloc
 xo-object