diff --git a/src/object2/DArray.cpp b/src/object2/DArray.cpp
index a70213f..a9ed928 100644
--- a/src/object2/DArray.cpp
+++ b/src/object2/DArray.cpp
@@ -183,7 +183,7 @@ namespace xo {
         DArray *
         DArray::shallow_move(obj<ACollector> gc) noexcept
         {
-            // note: not using gc.std_copy_for() here.
+            // note: not using gc.std_move_for() here.
             //       flexible array -> compiler doesn't know actual DArray allocation size
 
             DArray * copy = (DArray *)gc.alloc_copy((std::byte *)this);
diff --git a/src/object2/DBoolean.cpp b/src/object2/DBoolean.cpp
index a8d5e85..f24429e 100644
--- a/src/object2/DBoolean.cpp
+++ b/src/object2/DBoolean.cpp
@@ -38,7 +38,7 @@ namespace xo {
         DBoolean *
         DBoolean::shallow_move(obj<ACollector> gc) noexcept
         {
-            return gc.std_copy_for(this);
+            return gc.std_move_for(this);
         }
 
         size_t
diff --git a/src/object2/DDictionary.cpp b/src/object2/DDictionary.cpp
index 2f25f1b..48b0c97 100644
--- a/src/object2/DDictionary.cpp
+++ b/src/object2/DDictionary.cpp
@@ -276,7 +276,7 @@ namespace xo {
         DDictionary *
         DDictionary::shallow_move(obj<ACollector> gc) noexcept
         {
-            return gc.std_copy_for(this);
+            return gc.std_move_for(this);
         }
 
         std::size_t
diff --git a/src/object2/DFloat.cpp b/src/object2/DFloat.cpp
index 4a9041c..c00286c 100644
--- a/src/object2/DFloat.cpp
+++ b/src/object2/DFloat.cpp
@@ -36,7 +36,7 @@ namespace xo {
         DFloat *
         DFloat::shallow_move(obj<ACollector> gc) noexcept
         {
-            return gc.std_copy_for(this);
+            return gc.std_move_for(this);
         }
 
         size_t
diff --git a/src/object2/DInteger.cpp b/src/object2/DInteger.cpp
index 600f48e..53625fd 100644
--- a/src/object2/DInteger.cpp
+++ b/src/object2/DInteger.cpp
@@ -36,7 +36,7 @@ namespace xo {
         DInteger *
         DInteger::shallow_move(obj<ACollector> gc) noexcept
         {
-            return gc.std_copy_for(this);
+            return gc.std_move_for(this);
         }
 
         size_t
diff --git a/src/object2/DList.cpp b/src/object2/DList.cpp
index f17a53f..d9e5317 100644
--- a/src/object2/DList.cpp
+++ b/src/object2/DList.cpp
@@ -187,7 +187,7 @@ namespace xo {
         DList *
         DList::shallow_move(obj<ACollector> gc) noexcept
         {
-            return gc.std_copy_for(this);
+            return gc.std_move_for(this);
         }
 
         auto
diff --git a/src/object2/DRuntimeError.cpp b/src/object2/DRuntimeError.cpp
index a52e1df..469479c 100644
--- a/src/object2/DRuntimeError.cpp
+++ b/src/object2/DRuntimeError.cpp
@@ -61,7 +61,7 @@ namespace xo {
         DRuntimeError *
         DRuntimeError::shallow_move(obj<ACollector> gc) noexcept
         {
-            return gc.std_copy_for(this);
+            return gc.std_move_for(this);
         }
 
         std::size_t