diff --git a/lib/Connection.js b/lib/Connection.js
index 3efcadc..c6c4149 100644
--- a/lib/Connection.js
+++ b/lib/Connection.js
@@ -1697,7 +1697,8 @@ Connection.prototype._starttls = function() {
 
     self._sock.on('error', self._onError);
     self._sock.on('timeout', this._onSocketTimeout);
-    self._sock.setTimeout(config.socketTimeout);
+    self._sock.setTimeout(self._config.socketTimeout);
+
 
     self._parser.setStream(self._sock);
   });