diff --git a/CRM/Utils/File.php b/CRM/Utils/File.php
index 977b9fc8368e..c2299ec490bc 100644
--- a/CRM/Utils/File.php
+++ b/CRM/Utils/File.php
@@ -531,6 +531,11 @@ public static function restrictAccess($dir, $overwrite = FALSE) {
     if (!empty($dir) && is_dir($dir)) {
       $htaccess = <<<HTACCESS
 <Files "*">
+# OpenLiteSpeed 1.4.38+
+  <IfModule !authz_core_module>
+    RewriteRule .* - [F,L]
+  </IfModule>
+
 # Apache 2.2
   <IfModule !authz_core_module>
     Order allow,deny