diff --git a/lib/nodejs/lib/thrift/multiplexed_protocol.js b/lib/nodejs/lib/thrift/multiplexed_protocol.js
index 9caf6ab..d078aa2 100644
--- a/lib/nodejs/lib/thrift/multiplexed_protocol.js
+++ b/lib/nodejs/lib/thrift/multiplexed_protocol.js
@@ -52,17 +52,17 @@
   if (ServiceClient.Client) {
     ServiceClient = ServiceClient.Client;
   }
-  var self = this;
-  ServiceClient.prototype.new_seqid = function() {
-    self.seqid += 1;
-    return self.seqid;
-  };
   var writeCb = function(buf, seqid) {
     connection.write(buf,seqid);
   };
   var transport = new connection.transport(undefined, writeCb);
   var protocolWrapper = new Wrapper(serviceName, connection.protocol, connection);
   var client = new ServiceClient(transport, protocolWrapper);
+  var self = this;
+  client.new_seqid = function() {
+    self.seqid += 1;
+    return self.seqid;
+  };
 
   if (typeof connection.client !== 'object') {
     connection.client = {};