diff --git a/pandora_console/include/class/NewInstallationWelcomeWindow.class.php b/pandora_console/include/class/NewInstallationWelcomeWindow.class.php
index 62c06213cb..b7650850a5 100644
--- a/pandora_console/include/class/NewInstallationWelcomeWindow.class.php
+++ b/pandora_console/include/class/NewInstallationWelcomeWindow.class.php
@@ -456,7 +456,7 @@ class NewInstallationWelcomeWindow extends Wizard
 
 
     if( '.<?php echo $_SESSION['create_alert']; ?>.') {
-        document.getElementById("button-btn_create_alert").className =   "btn_alert_module__ok";
+        document.getElementById("button-btn_create_alert").className =   "btn_alert_module_ok";
         document.getElementById("button-btn_create_alert").onclick =   "";