diff --git a/xo-cmake/etc/xo/subsystem-list b/xo-cmake/etc/xo/subsystem-list
index 95e46f7e..3240c149 100644
--- a/xo-cmake/etc/xo/subsystem-list
+++ b/xo-cmake/etc/xo/subsystem-list
@@ -15,6 +15,7 @@ xo-stringtable2
 xo-object2
 xo-gc
 xo-type
+xo-procedure2
 xo-allocutil
 xo-alloc
 xo-object