diff --git a/include/xo/stringtable2/string/IGCObject_DString.hpp b/include/xo/stringtable2/string/IGCObject_DString.hpp
index 9607666..4eaa9dc 100644
--- a/include/xo/stringtable2/string/IGCObject_DString.hpp
+++ b/include/xo/stringtable2/string/IGCObject_DString.hpp
@@ -50,8 +50,6 @@ namespace xo {
             /** @defgroup scm-gcobject-dstring-methods **/
             ///@{
             // const methods
-            /** memory consumption for this instance **/
-            static size_type shallow_size(const DString & self) noexcept;
 
             // non-const methods
             /** move instance using allocator **/
diff --git a/include/xo/stringtable2/uniquestring/IGCObject_DUniqueString.hpp b/include/xo/stringtable2/uniquestring/IGCObject_DUniqueString.hpp
index 0a71251..b6e1d19 100644
--- a/include/xo/stringtable2/uniquestring/IGCObject_DUniqueString.hpp
+++ b/include/xo/stringtable2/uniquestring/IGCObject_DUniqueString.hpp
@@ -50,8 +50,6 @@ namespace xo {
             /** @defgroup scm-gcobject-duniquestring-methods **/
             ///@{
             // const methods
-            /** memory consumption for this instance **/
-            static size_type shallow_size(const DUniqueString & self) noexcept;
 
             // non-const methods
             /** move instance using allocator **/
diff --git a/src/stringtable2/IGCObject_DString.cpp b/src/stringtable2/IGCObject_DString.cpp
index e6e7fbb..d838e65 100644
--- a/src/stringtable2/IGCObject_DString.cpp
+++ b/src/stringtable2/IGCObject_DString.cpp
@@ -15,12 +15,6 @@
 
 namespace xo {
     namespace scm {
-        auto
-        IGCObject_DString::shallow_size(const DString & self) noexcept -> size_type
-        {
-            return self.shallow_size();
-        }
-
         auto
         IGCObject_DString::shallow_move(DString & self, obj<ACollector> gc) noexcept -> Opaque
         {
diff --git a/src/stringtable2/IGCObject_DUniqueString.cpp b/src/stringtable2/IGCObject_DUniqueString.cpp
index e865913..60a4d9b 100644
--- a/src/stringtable2/IGCObject_DUniqueString.cpp
+++ b/src/stringtable2/IGCObject_DUniqueString.cpp
@@ -15,12 +15,6 @@
 
 namespace xo {
     namespace scm {
-        auto
-        IGCObject_DUniqueString::shallow_size(const DUniqueString & self) noexcept -> size_type
-        {
-            return self.shallow_size();
-        }
-
         auto
         IGCObject_DUniqueString::shallow_move(DUniqueString & self, obj<ACollector> gc) noexcept -> Opaque
         {