diff --git a/server/wsproxy/master.h b/server/wsproxy/master.h
index 96c3980..a420210 100644
--- a/server/wsproxy/master.h
+++ b/server/wsproxy/master.h
@@ -44,4 +44,5 @@ class Master
     unsigned int recv_bufflen_ = 0;
     a8::TcpClient* tcp_client_ = nullptr;
     f8::TimerWp timer_wp_;
+    f8::Attacher attacher_;
 };