diff --git a/tests/system-test/2-query/hyperloglog.py b/tests/system-test/2-query/hyperloglog.py
index d3d2abaa58..590e820f29 100644
--- a/tests/system-test/2-query/hyperloglog.py
+++ b/tests/system-test/2-query/hyperloglog.py
@@ -208,7 +208,8 @@ class TDTestCase:
         tdSql.query("select hyperloglog(c1) from ct4 group by c7")
         tdSql.checkRows(3)
         tdSql.query("select hyperloglog(ct2.c1) from ct4 join ct2 on ct4.ts=ct2.ts")
-        tdSql.checkRows(self.rows + 2)
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, self.rows + 2)
         tdSql.query("select hyperloglog(c1), c1 from stb1")
         for i in range(tdSql.queryRows):
             tdSql.checkData(i, 0, 1) if  tdSql.queryResult[i][1] else tdSql.checkData(i,0, None)