diff --git a/server/wsproxy/upstreammgr.cc b/server/wsproxy/upstreammgr.cc
index a1634b1..fd492fa 100644
--- a/server/wsproxy/upstreammgr.cc
+++ b/server/wsproxy/upstreammgr.cc
@@ -4,6 +4,7 @@
 
 #include "upstreammgr.h"
 #include "upstream.h"
+#include "downstreammgr.h"
 
 void UpStreamMgr::Init()
 {
@@ -23,6 +24,8 @@ void UpStreamMgr::Init()
          IM_UpStreamDisconnect,
          [this] (const a8::Args& args)
          {
+             int instance_id = args.Get<int>(0);
+             DownStreamMgr::Instance()->OnUpStreamDisconnect(instance_id);
          });
 }