Index: libcfa/prelude/builtins.def
===================================================================
--- libcfa/prelude/builtins.def	(revision 72713e5bd3cf1fe33bcf6d53d418f97ac9ed6c2c)
+++ libcfa/prelude/builtins.def	(revision f5cb7c269226704242a4ae0da454d766be24093c)
@@ -867,4 +867,5 @@
 /* Object size checking builtins.  */
 DEF_GCC_BUILTIN	       (BUILT_IN_OBJECT_SIZE, "object_size", BT_FN_SIZE_CONST_PTR_INT, ATTR_PURE_NOTHROW_LEAF_LIST)
+DEF_GCC_BUILTIN	       (BUILT_IN_DYNAMIC_OBJECT_SIZE, "dynamic_object_size", BT_FN_SIZE_CONST_PTR_INT, ATTR_PURE_NOTHROW_LEAF_LIST)
 DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_MEMCPY_CHK, "__memcpy_chk", BT_FN_PTR_PTR_CONST_PTR_SIZE_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF)
 DEF_EXT_LIB_BUILTIN_CHKP (BUILT_IN_MEMMOVE_CHK, "__memmove_chk", BT_FN_PTR_PTR_CONST_PTR_SIZE_SIZE, ATTR_RET1_NOTHROW_NONNULL_LEAF)