diff --git a/src/legacy/ui/ui_render/bootstrap/template.js.hbs b/src/legacy/ui/ui_render/bootstrap/template.js.hbs
index d305626057540f..d8a55935b705a0 100644
--- a/src/legacy/ui/ui_render/bootstrap/template.js.hbs
+++ b/src/legacy/ui/ui_render/bootstrap/template.js.hbs
@@ -46,7 +46,7 @@ if (window.__kbnStrictCsp__ && window.__kbnCspNotEnforced__) {
     function createJavascriptElement(path) {
       var dom = document.createElement('script');
 
-      dom.setAttribute('async', '');
+      dom.setAttribute('defer', 'defer');
       dom.addEventListener('error', failure);
       dom.setAttribute('src', file);
       dom.addEventListener('load', next);