diff --git a/tests/system-test/2-query/sum.py b/tests/system-test/2-query/sum.py
index 1e428491a6..b600387603 100644
--- a/tests/system-test/2-query/sum.py
+++ b/tests/system-test/2-query/sum.py
@@ -228,7 +228,7 @@ class TDTestCase:
 
             # query
             col = f"c{i}"
-            sql = f"select count({col}), sum({col}), avg({col}), max({col}), min({col}), stddev({col}, leastsquares({col},1,9)) from stb"
+            sql = f"select count({col}), sum({col}), avg({col}), max({col}), min({col}), stddev({col}), leastsquares({col},1,9)) from stb"
             tdSql.query(sql)
             # sum
             tdSql.checkData(0, 0, 4*10000, True)