diff --git a/tests/system-test/2-query/unique.py b/tests/system-test/2-query/unique.py
index fce0d21f4d0620d96c90c4273610b7def44e1f13..3e6e14be386e188fffc3d748fc19029d4a71990c 100644
--- a/tests/system-test/2-query/unique.py
+++ b/tests/system-test/2-query/unique.py
@@ -426,7 +426,7 @@ class TDTestCase:
         tdSql.query(" select unique(t1+c1) from stb1 ")
         tdSql.checkRows(13)
         tdSql.query(" select unique(t1+c1) from stb1 partition by tbname ")
-        tdSql.checkRows(13)
+        tdSql.checkRows(20)
         tdSql.query(" select unique(t1) from stb1 partition by tbname ")
         tdSql.checkRows(2)