diff --git a/src/ping.js b/src/ping.js
index 1a3f7a6..50232aa 100644
--- a/src/ping.js
+++ b/src/ping.js
@@ -40,7 +40,7 @@ function ping(options, cb) {
   // TODO: refactor with src/client/setProtocol.js
   client.on('connect', function() {
     client.write('set_protocol', {
-      protocolVersion: -1,
+      protocolVersion: options.protocolVersion,
       serverHost: options.host,
       serverPort: options.port,
       nextState: 1