diff --git a/etc/xo/subsystem-list b/etc/xo/subsystem-list
index d91621bf..0086b814 100644
--- a/etc/xo/subsystem-list
+++ b/etc/xo/subsystem-list
@@ -8,6 +8,7 @@ xo-arena
 xo-facet
 xo-testutil
 xo-alloc2
+xo-gc
 xo-alloc
 xo-object
 xo-refcnt