diff --git a/server/wsproxy/target_conn.cc b/server/wsproxy/target_conn.cc
index 8c4bda9..41a63bc 100644
--- a/server/wsproxy/target_conn.cc
+++ b/server/wsproxy/target_conn.cc
@@ -126,7 +126,7 @@ void TargetConn::on_socketread(a8::TcpClient* sender, char* buf, unsigned int le
     while (recv_bufflen_ - offset >= sizeof(f8::WSProxyPackHead_S)) {
         f8::WSProxyPackHead_S* p = (f8::WSProxyPackHead_S*) &recv_buff_[offset];
         if (p->magic_code == f8::MAGIC_CODE) {
-            if (recv_bufflen_ - offset < sizeof(f8::PackHead) + p->packlen) {
+            if (recv_bufflen_ - offset < sizeof(f8::WSProxyPackHead_S) + p->packlen) {
                 break;
             }
             App::Instance()->AddSocketMsg(SF_TargetServer,
@@ -136,7 +136,7 @@ void TargetConn::on_socketread(a8::TcpClient* sender, char* buf, unsigned int le
                                           p->seqid,
                                           &recv_buff_[offset + sizeof(f8::WSProxyPackHead_S)],
                                           p->packlen);
-            offset += sizeof(f8::PackHead) + p->packlen;
+            offset += sizeof(f8::WSProxyPackHead_S) + p->packlen;
         } else {
             warning = true;
             offset++;