diff --git a/lib/node-http-proxy/http-proxy.js b/lib/node-http-proxy/http-proxy.js
index 7ae8b6c..9e5e545 100644
--- a/lib/node-http-proxy/http-proxy.js
+++ b/lib/node-http-proxy/http-proxy.js
@@ -753,9 +753,11 @@ HttpProxy.prototype.proxyWebSocketRequest = function (req, socket, head, buffer)
 HttpProxy.prototype.close = function () {
   [this.forward, this.target].forEach(function (proxy) {
     if (proxy && proxy.agent) {
-      proxy.agent.sockets.forEach(function (socket) {
-        socket.end();
-      });
+      for (var host in proxy.agent.sockets) {
+        proxy.agent.sockets[host].forEach(function (socket) {
+          socket.end();
+        });
+      }
     }
   });
 };