diff --git a/lmdeploy/model.py b/lmdeploy/model.py
index 99797abb68..e66daa438b 100644
--- a/lmdeploy/model.py
+++ b/lmdeploy/model.py
@@ -975,7 +975,7 @@ def messages2prompt(self, messages, sequence_start=True,
                     ret += f'\n<tool_call>\n{{"name": "{toolCall["name"]}, "arguments": {json.dumps(tools["arguments"])}"\n</toolcall>}}'
             if message['role'] == 'tool':
                 if index == 0 or messages[index - 1]['role'] != 'tool':
-                    ret += f"{box_map[message['role']]}"
+                    ret += f"{self.user}"
                 ret += f"\n<tool_response>\n{message['content']}\n</tool_response>"
                 if index == len(messages) - 1 or messages[index + 1]['role'] != 'tool':
                     ret += f"{self.eoh}"