diff --git a/lib/faye/websocket/protocol8_parser/handshake.js b/lib/faye/websocket/protocol8_parser/handshake.js
index a531311..24a4bc5 100644
--- a/lib/faye/websocket/protocol8_parser/handshake.js
+++ b/lib/faye/websocket/protocol8_parser/handshake.js
@@ -84,7 +84,7 @@ Handshake.prototype.isValid = function() {
   
   return upgrade && /^websocket$/i.test(upgrade) &&
          connection && connection.split(/\s*,\s*/).indexOf('Upgrade') >= 0 &&
-         (!this._protocols || this.protocol) &&
+         ((!this._protocols && !protocol) || this.protocol) &&
          this._headers['Sec-WebSocket-Accept'] === this._accept;
 };