diff --git a/tests/system-test/1-insert/opentsdb_json_taosc_insert.py b/tests/system-test/1-insert/opentsdb_json_taosc_insert.py
index 857a8e3a32..91ef1e70a3 100644
--- a/tests/system-test/1-insert/opentsdb_json_taosc_insert.py
+++ b/tests/system-test/1-insert/opentsdb_json_taosc_insert.py
@@ -24,6 +24,8 @@ import threading
 import json
 
 class TDTestCase:
+    updatecfgDict = {'clientCfg': {'smlDot2Underline': 0}}
+
     def init(self, conn, logSql, replicaVar=1):
         self.replicaVar = int(replicaVar)
         tdLog.debug("start to execute %s" % __file__)
diff --git a/tests/system-test/1-insert/opentsdb_telnet_line_taosc_insert.py b/tests/system-test/1-insert/opentsdb_telnet_line_taosc_insert.py
index 351cf49e3a..d419aee12c 100644
--- a/tests/system-test/1-insert/opentsdb_telnet_line_taosc_insert.py
+++ b/tests/system-test/1-insert/opentsdb_telnet_line_taosc_insert.py
@@ -28,6 +28,8 @@ if platform.system().lower() == 'windows':
     sys.stdout = io.TextIOWrapper(sys.stdout.buffer,encoding='utf8')
 
 class TDTestCase:
+    updatecfgDict = {'clientCfg': {'smlDot2Underline': 0}}
+
     def init(self, conn, logSql, replicaVar=1):
         self.replicaVar = int(replicaVar)
         tdLog.debug("start to execute %s" % __file__)