diff --git a/src/main/resources/org/jenkinsci/plugins/scriptler/builder/ScriptlerBuilder/config.jelly b/src/main/resources/org/jenkinsci/plugins/scriptler/builder/ScriptlerBuilder/config.jelly
index b575a6a..578e71b 100644
--- a/src/main/resources/org/jenkinsci/plugins/scriptler/builder/ScriptlerBuilder/config.jelly
+++ b/src/main/resources/org/jenkinsci/plugins/scriptler/builder/ScriptlerBuilder/config.jelly
@@ -64,7 +64,7 @@
 	<st:bind var="scriptlerBuilderDesc" value="${descriptor}"/>
 	<st:once>
 		<script type="text/javascript">
-			Event.observe(window, 'load', function() { 
+			window.addEventListener('load', function() { 
 				var all = new Array();
 	   			all = document.getElementsByName('scriptlerScriptId');
 				for(var i = 0; i &lt; all.length; i++) {