diff --git a/core/my_basic.h b/core/my_basic.h
index 82a3697..bf84569 100755
--- a/core/my_basic.h
+++ b/core/my_basic.h
@@ -400,6 +400,7 @@ MBAPI int mb_set_coll(struct mb_interpreter_t* s, void** l, mb_value_t coll, mb_
 MBAPI int mb_remove_coll(struct mb_interpreter_t* s, void** l, mb_value_t coll, mb_value_t idx);
 MBAPI int mb_count_coll(struct mb_interpreter_t* s, void** l, mb_value_t coll, int* c);
 MBAPI int mb_make_ref_value(struct mb_interpreter_t* s, void* val, mb_value_t* out, mb_dtor_func_t un, mb_clone_func_t cl, mb_hash_func_t hs, mb_cmp_func_t cp, mb_fmt_func_t ft);
+MBAPI int mb_get_ref_value(struct mb_interpreter_t* s, void** l, mb_value_t val, void** out);
 MBAPI int mb_ref_value(struct mb_interpreter_t* s, void** l, mb_value_t val);
 MBAPI int mb_unref_value(struct mb_interpreter_t* s, void** l, mb_value_t val);
 MBAPI int mb_dispose_value(struct mb_interpreter_t* s, mb_value_t val);