diff --git a/examples/centos-6.4.conf b/examples/centos-6.4.conf
index 64232b1..9e4ee99 100644
--- a/examples/centos-6.4.conf
+++ b/examples/centos-6.4.conf
@@ -10,7 +10,7 @@
         "iso_name": "CentOS-6.4-x86_64-minimal.iso",
         "http_directory": "http",
         "local_ip": "10.80.3.223",
-        "install_timeout": "600",
+        "install_timeout": "600s",
         "ssh_username": "root",
         "ssh_password": "vmpassword",
         "boot_command":