diff --git a/src/llmtuner/data/template.py b/src/llmtuner/data/template.py
index 1bf24063..b852eb3d 100644
--- a/src/llmtuner/data/template.py
+++ b/src/llmtuner/data/template.py
@@ -499,7 +499,9 @@ register_template(
         "[INST] {{query}} [/INST]"
     ],
     system="",
-    sep=[]
+    sep=[
+        " "
+    ]
 )