diff --git a/localserver/cmt_server.cpp b/localserver/cmt_server.cpp
index 47fe66a..d77fb37 100644
--- a/localserver/cmt_server.cpp
+++ b/localserver/cmt_server.cpp
@@ -75,7 +75,7 @@ void CMTSession::do_read() {
             pkg_head.head[2] = 0xAA;
             pkg_head.cmd = cmd;
             pkg_head.len = send_data_len;
-            memset(data_,0,sizeof(CMT_TCP_LEN));
+            memset(data_,0,CMT_TCP_LEN);
             memcpy(data_, &pkg_head, head_len_);
             memcpy(data_ + head_len_, &send_data, send_data_len);   
             do_write(head_len_ + send_data_len);