diff --git a/api/apps/chunk_app.py b/api/apps/chunk_app.py
index 3b588db94..4f98eaa07 100644
--- a/api/apps/chunk_app.py
+++ b/api/apps/chunk_app.py
@@ -150,7 +150,7 @@ def set():
             if len(arr) != 2:
                 return get_data_error_result(
                     retmsg="Q&A must be separated by TAB/ENTER key.")
-            q, a = rmPrefix(arr[0]), rmPrefix[arr[1]]
+            q, a = rmPrefix(arr[0]), rmPrefix(arr[1])
             d = beAdoc(d, arr[0], arr[1], not any(
                 [rag_tokenizer.is_chinese(t) for t in q + a]))