diff --git a/src/object2/IGCObject_DFloat.cpp b/src/object2/IGCObject_DFloat.cpp
index 9d9a65d..be4849a 100644
--- a/src/object2/IGCObject_DFloat.cpp
+++ b/src/object2/IGCObject_DFloat.cpp
@@ -25,8 +25,7 @@ namespace xo {
         IGCObject_DFloat::shallow_copy(const DFloat & src,
                                        obj<AAllocator> mm) noexcept
         {
-            DFloat * copy = (DFloat *)mm.alloc(typeseq::id<DFloat>(),
-                                               sizeof(DFloat));
+            DFloat * copy = (DFloat *)mm.alloc_copy((std::byte *)&src);
 
             if (copy)
                 *copy = src;
diff --git a/src/object2/IGCObject_DInteger.cpp b/src/object2/IGCObject_DInteger.cpp
index d6c80bb..cbc27f6 100644
--- a/src/object2/IGCObject_DInteger.cpp
+++ b/src/object2/IGCObject_DInteger.cpp
@@ -23,10 +23,9 @@ namespace xo {
 
         DInteger *
         IGCObject_DInteger::shallow_copy(const DInteger & src,
-                                       obj<AAllocator> mm) noexcept
+                                         obj<AAllocator> mm) noexcept
         {
-            DInteger * copy = (DInteger *)mm.alloc(typeseq::id<DInteger>(),
-                                                   sizeof(DInteger));
+            DInteger * copy = (DInteger *)mm.alloc_copy((std::byte *)&src);
 
             if (copy)
                 *copy = src;
diff --git a/src/object2/IGCObject_DList.cpp b/src/object2/IGCObject_DList.cpp
index a30f2c6..2139d68 100644
--- a/src/object2/IGCObject_DList.cpp
+++ b/src/object2/IGCObject_DList.cpp
@@ -24,8 +24,7 @@ namespace xo {
         IGCObject_DList::shallow_copy(const DList & src,
                                       obj<AAllocator> mm) noexcept
         {
-            /* FIXME: need to supply object age here */
-            DList * copy = (DList *)mm.alloc(typeseq::id<DList>(), sizeof(DList));
+            DList * copy = (DList *)mm.alloc_copy((std::byte *)&src);
 
             if (copy)
                 *copy = src;
diff --git a/utest/X1Collector.test.cpp b/utest/X1Collector.test.cpp
index bc579e9..b15a0c5 100644
--- a/utest/X1Collector.test.cpp
+++ b/utest/X1Collector.test.cpp
@@ -194,14 +194,14 @@ namespace ut {
                         REQUIRE(info.tseq() == typeseq::id<DList>().seqno());
                         REQUIRE(info.size() >= sizeof(DList));
                         REQUIRE(info.size() < sizeof(DList) + padding::c_alloc_alignment);
-
                     }
                 }
 
+
+
                 /* no GC roots, so GC is trivial */
                 c_o.request_gc(generation{1});
 
-
             } catch (std::exception & ex) {
                 std::cerr << "caught exception: " << ex.what() << std::endl;
                 REQUIRE(false);