diff --git a/lib/http-proxy/passes/ws-incoming.js b/lib/http-proxy/passes/ws-incoming.js
index bafdf567d..2eb742992 100644
--- a/lib/http-proxy/passes/ws-incoming.js
+++ b/lib/http-proxy/passes/ws-incoming.js
@@ -136,6 +136,7 @@ module.exports = {
         proxySocket.end();
       });
 
+      socket.on('close', () => proxySocket.end());
       socket.on('end', () => socket.end());
 
       common.setupSocket(proxySocket);