diff --git a/AppInfo.php b/AppInfo.php
index 4b84977..b9ceaba 100644
--- a/AppInfo.php
+++ b/AppInfo.php
@@ -34,7 +34,7 @@ public static function appSecret() {
    * @return the home URL for this site
    */
   public static function getHome () {
-    return ($_SERVER['HTTP_X_FORWARDED_PROTO'] || "http") . "//" . $_SERVER['HTTP_HOST'] . "/";
+    return ($_SERVER['HTTP_X_FORWARDED_PROTO'] ?: "http") . "//" . $_SERVER['HTTP_HOST'] . "/";
   }
 
 }