diff --git a/xo-cmake/etc/xo/subsystem-list b/xo-cmake/etc/xo/subsystem-list
index 006ddfd1..0fca51d1 100644
--- a/xo-cmake/etc/xo/subsystem-list
+++ b/xo-cmake/etc/xo/subsystem-list
@@ -5,6 +5,7 @@ xo-randomgen
 xo-flatstring
 xo-reflectutil
 xo-arena
+xo-facet
 xo-alloc
 xo-object
 xo-refcnt