diff --git a/include/xo/alloc/Forwarding1.hpp b/include/xo/alloc/Forwarding1.hpp
index 6276c1ad..77e081f9 100644
--- a/include/xo/alloc/Forwarding1.hpp
+++ b/include/xo/alloc/Forwarding1.hpp
@@ -30,7 +30,7 @@ namespace xo {
             /** required by Object i/face, but never called on Forwarding1 **/
             virtual std::size_t _shallow_size() const final override;
             /** required by Object i/face, but never called on Forwarding1 **/
-            virtual Object *    _shallow_copy() const final override;
+            virtual Object *    _shallow_copy(gc::IAlloc * mm) const final override;
             /** required by Object i/face, but never called on Forwarding1 **/
             virtual std::size_t _forward_children() final override;
 
diff --git a/include/xo/alloc/Object.hpp b/include/xo/alloc/Object.hpp
index 5727331e..849cf9bb 100644
--- a/include/xo/alloc/Object.hpp
+++ b/include/xo/alloc/Object.hpp
@@ -57,6 +57,9 @@ namespace xo {
                 return (u2 <= u1 + sizeof(std::uintptr_t));
         }
 
+        /** (for consistency's sake) **/
+        T * get() const { return ptr_; }
+
         T * ptr() const { return ptr_; }
         T ** ptr_address() { return &ptr_; }
 
@@ -204,7 +207,7 @@ namespace xo {
          *
          *  Require: @ref mm is an instance of @ref gc::GC
          **/
-        virtual Object * _shallow_copy() const = 0;
+        virtual Object * _shallow_copy(gc::IAlloc * mm) const = 0;
 
         /** update child pointers that refer to forwarding pointers,
          *  replacing them with the correct destination.
diff --git a/src/alloc/Forwarding1.cpp b/src/alloc/Forwarding1.cpp
index 4b47e4f2..b4a44ff6 100644
--- a/src/alloc/Forwarding1.cpp
+++ b/src/alloc/Forwarding1.cpp
@@ -52,7 +52,7 @@ namespace xo {
 
         // LCOV_EXCL_START
         Object *
-        Forwarding1::_shallow_copy() const {
+        Forwarding1::_shallow_copy(gc::IAlloc *) const {
             assert(false);
             return nullptr;
         }
diff --git a/src/alloc/Object.cpp b/src/alloc/Object.cpp
index 475d84ad..309e0886 100644
--- a/src/alloc/Object.cpp
+++ b/src/alloc/Object.cpp
@@ -170,7 +170,7 @@ namespace xo {
          */
         if (gc->fromspace_contains(src))
         {
-            Object * dest = src->_shallow_copy();
+            Object * dest = src->_shallow_copy(gc);
 
             if (dest != src)
                 src->_forward_to(dest);