diff --git a/resources/DirectoryLister.php b/resources/DirectoryLister.php
index c7bdc7c..5615b77 100644
--- a/resources/DirectoryLister.php
+++ b/resources/DirectoryLister.php
@@ -681,12 +681,8 @@ class DirectoryLister {
     protected function _getAppUrl() {
 
         // Get the server protocol
-        if (!empty($_SERVER['HTTPS'])) {
-            if ($_SERVER['HTTPS']!=="off" {
-                $protocol = 'https://';
-            } else {
-                $protocol = 'http://';
-            }
+        if (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS']!=="off") {
+            $protocol = 'https://';
         } else {
             $protocol = 'http://';
         }