diff --git a/tests/system-test/2-query/sum.py b/tests/system-test/2-query/sum.py
index 92b4ca8afc..f449597841 100644
--- a/tests/system-test/2-query/sum.py
+++ b/tests/system-test/2-query/sum.py
@@ -245,7 +245,7 @@ class TDTestCase:
             # stddev
             tdSql.checkData(0, 5, 0, True)
 
-            sql = f"select twa({col}) from d0"
+            sql = f"select twa({col}) from {dbname}.d0"
             tdSql.query(sql)
             tdSql.checkData(0, 0, 1, True)