diff --git a/include/xo/allocutil/IObject.hpp b/include/xo/allocutil/IObject.hpp
index 6cad929..932966d 100644
--- a/include/xo/allocutil/IObject.hpp
+++ b/include/xo/allocutil/IObject.hpp
@@ -7,6 +7,7 @@
 
 #include <cstddef>
 #include <cstdint>
+#include <type_traits>
 
 namespace xo {
     namespace gc { class IAlloc; }
diff --git a/include/xo/allocutil/ObjectVisitor.hpp b/include/xo/allocutil/ObjectVisitor.hpp
index df33687..420d44c 100644
--- a/include/xo/allocutil/ObjectVisitor.hpp
+++ b/include/xo/allocutil/ObjectVisitor.hpp
@@ -36,8 +36,9 @@ namespace xo {
          **/
         template <typename T>
         class ObjectVisitor {
-            void forward_children(T & target,
-                                  IAlloc * gc) { (void)target; (void)gc; }
+//        public:
+//            void forward_children(T & target,
+//                                  IAlloc * gc) { (void)target; (void)gc; }
         };
 
 #define XO_TRIVIAL_OBJECT_VISITOR(TYPE)                       \