diff --git a/lib/js/src/thrift.js b/lib/js/src/thrift.js
index 37ba690..ab85e9d 100644
--- a/lib/js/src/thrift.js
+++ b/lib/js/src/thrift.js
@@ -575,6 +575,15 @@
             clientCallback();
           };
         }()));
+        if(callback) {
+          this.callbacks.push((function() {
+            var clientCallback = callback;
+            return function(msg) {
+              self.setRecvBuffer(msg);
+              clientCallback();
+            };
+          }()));
+        }
       } else {
         //Queue the send to go out __onOpen
         this.send_pending.push({