diff --git a/include/xo/alloc2/alloc/RAllocator.hpp b/include/xo/alloc2/alloc/RAllocator.hpp
index 729778e..4d2af7f 100644
--- a/include/xo/alloc2/alloc/RAllocator.hpp
+++ b/include/xo/alloc2/alloc/RAllocator.hpp
@@ -36,11 +36,16 @@ namespace xo {
                 return O::iface()->alloc(O::data(), typeseq::id<T>(), n);
             }
 
+            template <typename T>
+            void * alloc_copy_for(const T * src) noexcept {
+                return O::iface()->alloc_copy(O::data(), (std::byte*)const_cast<T *>(src));
+            }
+
             template <typename T>
             T * std_copy_for(const T * src) noexcept {
                 // TODO: fix alloc_copy(), should take const std::byte *
 
-                T * copy = (T *)O::iface()->alloc_copy(O::data(), (std::byte*)const_cast<T *>(src));
+                T * copy = (T *)(this->alloc_copy_for(src));
 
                 if (copy) {
                     *copy = *src;