diff --git a/lib/io/ioserver.js b/lib/io/ioserver.js
index a00e7eec..ad852539 100644
--- a/lib/io/ioserver.js
+++ b/lib/io/ioserver.js
@@ -128,7 +128,7 @@ function addTypecheckedFunctions(sock) {
 function handleConnection(sock) {
     var ip = sock.request.connection.remoteAddress;
     if (!ip) {
-        socket.emit("kick", {
+        sock.emit("kick", {
             reason: "Your IP address could not be determined from the socket connection.  See https://github.com/Automattic/socket.io/issues/1387#issuecomment-48425088 for details"
         });
         return;