diff --git a/aw/cxx/distributed/distributed_major.cpp b/aw/cxx/distributed/distributed_major.cpp
index 87a243e9c16dbdfc1baba632d892b07d7ed51a4a..549cdb3bf60e085499f428905e152d3e58a1e07c 100644
--- a/aw/cxx/distributed/distributed_major.cpp
+++ b/aw/cxx/distributed/distributed_major.cpp
@@ -251,7 +251,7 @@ bool DistributeTestEnvironment::RunTestCmd(size_t devNo, const std::string &strC
     bool breturn = false;
     size_t lenptr = 0;
     errno_t ret = EOK;
-    (void)memset_s(szbuf, MAX_BUFF_LEN, 0, MAX_BUFF_LEN);
+    (void)memset_s(szbuf, sizeof(szbuf), 0, sizeof(szbuf));
 
     // add 2 '\0'
     size_t rlen = cmdLen + expectValueLen + DST_COMMAND_HEAD_LEN + sizeof(int)*HALF_BUF_LEN + HALF_BUF_LEN;