diff --git a/include/rtti/typeinfo.h b/include/rtti/typeinfo.h
index 0d68da4..527d9fc 100644
--- a/include/rtti/typeinfo.h
+++ b/include/rtti/typeinfo.h
@@ -63,6 +63,8 @@ typedef struct typeinfo_ typeinfo_t;
 /* calculate the size of data */
 typedef size_t (*datasize_fn_t)(va_list);
 
+typedef void (*destroy_fn_t)(void*);
+
 /* object life cycle */
 typedef int (*obj_init_fn_t)(meta_obj_t*, va_list);
 typedef void (*obj_destroy_fn_t)(meta_obj_t*);