diff --git a/include/xo/alloc2/AGCObject.hpp b/include/xo/alloc2/AGCObject.hpp
index ef9e33a..fc9c016 100644
--- a/include/xo/alloc2/AGCObject.hpp
+++ b/include/xo/alloc2/AGCObject.hpp
@@ -5,8 +5,11 @@
 
 #pragma once
 
+#include "IAllocator_Any.hpp"
+#include "RAllocator.hpp"
 #include "xo/facet/facet_implementation.hpp"
 #include "xo/facet/typeseq.hpp"
+#include "xo/facet/obj.hpp"
 #include <cstdint>
 #include <cstddef>
 
@@ -28,7 +31,8 @@ namespace xo {
             virtual int32_t _typeseq() const noexcept = 0;
 
             virtual size_type shallow_size(Copaque d) const noexcept = 0;
-            virtual Opaque * shallow_copy(Copaque d) const noexcept = 0;
+            virtual Opaque * shallow_copy(Copaque d,
+                                          obj<AAllocator> mm) const noexcept = 0;
             virtual size_type forward_children(Opaque d) const noexcept = 0;
         };
 
diff --git a/include/xo/alloc2/IGCObject_Any.hpp b/include/xo/alloc2/IGCObject_Any.hpp
index 114b17a..039a125 100644
--- a/include/xo/alloc2/IGCObject_Any.hpp
+++ b/include/xo/alloc2/IGCObject_Any.hpp
@@ -30,9 +30,10 @@ namespace xo {
             // from AGCObject
             int32_t _typeseq() const noexcept override { return s_typeseq; }
 
-            [[noreturn]] size_type shallow_size() const noexcept override { _fatal(); }
-            [[noreturn]] Opaque * shallow_copy() const noexcept override { _fatal(); }
-            [[noreturn]] size_type forward_children() const noexcept override { _fatal(); }
+            [[noreturn]] size_type shallow_size(Copaque) const noexcept override { _fatal(); }
+            [[noreturn]] Opaque * shallow_copy(Copaque,
+                                               obj<AAllocator>) const noexcept override { _fatal(); }
+            [[noreturn]] size_type forward_children(Opaque) const noexcept override { _fatal(); }
 
         private:
             [[noreturn]] static void _fatal();
diff --git a/include/xo/alloc2/IGCObject_Xfer.hpp b/include/xo/alloc2/IGCObject_Xfer.hpp
index 1756d38..75f78fd 100644
--- a/include/xo/alloc2/IGCObject_Xfer.hpp
+++ b/include/xo/alloc2/IGCObject_Xfer.hpp
@@ -30,8 +30,8 @@ namespace xo {
             size_type shallow_size(Copaque d) const noexcept override {
                 return I::shallow_copy(_dcast(d));
             }
-            Opaque * shallow_copy(Copaque d) const noexcept override {
-                return I::shallow_size(_dcast(d));
+            Opaque * shallow_copy(Copaque d, obj<AAllocator> mm) const noexcept override {
+                return I::shallow_size(_dcast(d), mm);
             }
 
             // non-const methods
diff --git a/include/xo/alloc2/RAllocator.hpp b/include/xo/alloc2/RAllocator.hpp
index 8f1bc80..012c7c2 100644
--- a/include/xo/alloc2/RAllocator.hpp
+++ b/include/xo/alloc2/RAllocator.hpp
@@ -5,6 +5,7 @@
 
 #pragma once
 
+#include "AAllocator.hpp"
 #include "xo/facet/RRouter.hpp"
 #include <string>