diff --git a/tests/system-test/1-insert/stt_blocks_check.py b/tests/system-test/1-insert/stt_blocks_check.py
index 5de6414453..122a8ac4d9 100644
--- a/tests/system-test/1-insert/stt_blocks_check.py
+++ b/tests/system-test/1-insert/stt_blocks_check.py
@@ -20,6 +20,7 @@ from util.sqlset import *
 from util.boundary import *
 
 class TDTestCase:
+    updatecfgDict = {'debugFlag': 143}
     def init(self, conn, logSql, replicaVar=1):
         self.replicaVar = int(replicaVar)
         tdLog.debug("start to execute %s" % __file__)