diff --git a/examples/example2.js b/examples/example2.js
index <HASH>..<HASH> 100644
--- a/examples/example2.js
+++ b/examples/example2.js
@@ -13,7 +13,7 @@ hosts.forEach(function (host) {
 hosts.forEach(function (host) {
     ping.promise.probe(host, {
         timeout: 10,
-        extra: ["-i 2"]
+        extra: ["-i", "2"]
     })
     .then(function (res) {
             console.log(res);
Fix bug on window platform

--Overview
1. Window's ping command treat '-i 2' as an invalid option. Therefore,
we must split them up. IE using ['-i', '2'] instead of ['-i 2']