diff --git a/etc/xo/subsystem-list b/etc/xo/subsystem-list
index c2ebcd9e..d91621bf 100644
--- a/etc/xo/subsystem-list
+++ b/etc/xo/subsystem-list
@@ -7,6 +7,7 @@ xo-reflectutil
 xo-arena
 xo-facet
 xo-testutil
+xo-alloc2
 xo-alloc
 xo-object
 xo-refcnt