diff --git a/tests/system-test/2-query/sum.py b/tests/system-test/2-query/sum.py
index 5e372bca20..92b4ca8afc 100644
--- a/tests/system-test/2-query/sum.py
+++ b/tests/system-test/2-query/sum.py
@@ -245,6 +245,10 @@ class TDTestCase:
             # stddev
             tdSql.checkData(0, 5, 0, True)
 
+            sql = f"select twa({col}) from d0"
+            tdSql.query(sql)
+            tdSql.checkData(0, 0, 1, True)
+
             i += 1