diff --git a/lib/Connection.js b/lib/Connection.js
index e8bf925..31dd13a 100644
--- a/lib/Connection.js
+++ b/lib/Connection.js
@@ -1013,9 +1013,6 @@ Connection.prototype._resUntagged = function(info) {
                                         });
         for (i = 0, len = keywords.length; i < len; ++i)
           permFlags.splice(permFlags.indexOf(keywords[i]), 1);
-        this._box.permFlags = permFlags.map(function(f) {
-                                return f.substr(1).toLowerCase();
-                              });
       }
     }
   } else if (type === 'list') {