diff --git a/sl_tp_guard.py b/sl_tp_guard.py
index adf35ac..ec77431 100644
--- a/sl_tp_guard.py
+++ b/sl_tp_guard.py
@@ -7,7 +7,7 @@ import time
 from typing import Any, Callable, Optional
 
 from contract_specs import get_contract_spec
-from symbols import ths_to_vnpy_symbol
+from ctp_symbol import ths_to_vnpy_symbol
 from vnpy_bridge import (
     ctp_list_active_orders,
     ctp_list_positions,