diff --git a/lib/Connection.js b/lib/Connection.js
index ca12679..199daf7 100644
--- a/lib/Connection.js
+++ b/lib/Connection.js
@@ -1076,6 +1076,7 @@ Connection.prototype._resTagged = function(info) {
     else
       errtext = info.text;
     err = new Error(errtext);
+    err.type = info.type;
     err.textCode = info.textCode;
     err.source = 'protocol';
   } else if (this._box) {