diff --git a/src/llmtuner/data/formatter.py b/src/llmtuner/data/formatter.py
index 07438489..5eb3a658 100644
--- a/src/llmtuner/data/formatter.py
+++ b/src/llmtuner/data/formatter.py
@@ -19,7 +19,7 @@ TOOL_SYSTEM_PROMPT = (
     "```\n"
     "Action: the action to take, should be one of [{tool_names}] if using a tool.\n"
     "Action Input: the input to the action{format_prompt}.\n"
-    "```"
+    "```\n"
 )