diff --git a/snappymail/v/0.0.0/app/templates/Index.html b/snappymail/v/0.0.0/app/templates/Index.html
index 85d171233..a3831c05f 100644
--- a/snappymail/v/0.0.0/app/templates/Index.html
+++ b/snappymail/v/0.0.0/app/templates/Index.html
@@ -14,8 +14,8 @@
 	{{BaseAppFaviconPngLinkTag}}
 	{{BaseAppFaviconTouchLinkTag}}
 	<style id="app-boot-css">{{BaseAppBootCss}}</style>
-	<link type="text/css" rel="stylesheet" data-href="{{BaseAppMainCssLink}}" id="app-css" />
-	<link type="text/css" rel="stylesheet" data-href="{{BaseAppThemeCssLink}}" id="app-theme-link" />
+	<link type="text/css" rel="stylesheet" data-href="{{BaseAppMainCssLink}}" id="app-css" rel="preload"/>
+	<link type="text/css" rel="stylesheet" data-href="{{BaseAppThemeCssLink}}" id="app-theme-link" rel="preload"/>
 	<link rel="manifest" href="{{BaseAppManifestLink}}" />
 	<script>document.append||document.location.replace('./?/BadBrowser');</script>
 </head>