diff --git a/CMakeLists.txt b/CMakeLists.txt
index 06c4dea0..cb162524 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -67,7 +67,7 @@ message("-- CMAKE_INSTALL_RPATH=${CMAKE_INSTALL_RPATH}")
 add_subdirectory(xo-cmake)
 add_subdirectory(xo-indentlog)
 add_subdirectory(xo-refcnt)
-#add_subdirectory(xo-subsys)
+add_subdirectory(xo-subsys)
 #add_subdirectory(xo-randomgen)
 #add_subdirectory(xo-ordinaltree)
 #add_subdirectory(xo-pyutil)