diff --git a/tests/pytest/client/client.py b/tests/pytest/client/client.py
index 6ac12c679554862e98a080fe91d4baab29556055..36c06ac09daf26ef0e23130a01111919501c6f46 100644
--- a/tests/pytest/client/client.py
+++ b/tests/pytest/client/client.py
@@ -42,8 +42,8 @@ class TDTestCase:
 
         ret = tdSql.query('show dnodes')
 
-        ret = tdSql.execute('alter dnode "%s" debugFlag 135' % tdSql.getData(0,1))
-        tdLog.info('alter dnode "%s" debugFlag 135 -> ret: %d' % (tdSql.getData(0, 1), ret))
+        ret = tdSql.execute('alter dnode "%s" debugFlag 135' % tdSql.getData(0,0))
+        tdLog.info('alter dnode "%s" debugFlag 135 -> ret: %d' % (tdSql.getData(0, 0), ret))
 
     def stop(self):
         tdSql.close()