diff --git a/workflow/engine/src/ProcessMaker/Core/System.php b/workflow/engine/src/ProcessMaker/Core/System.php
index 16b21bc78..d846a9cc5 100644
--- a/workflow/engine/src/ProcessMaker/Core/System.php
+++ b/workflow/engine/src/ProcessMaker/Core/System.php
@@ -1534,7 +1534,8 @@ class System
      */
     public static function getServerProtocol()
     {
-        return G::is_https() ? "https://" : "http://";
+        $envProtocol = defined("REQUEST_SCHEME") && REQUEST_SCHEME === "https";
+        return G::is_https() || $envProtocol ? "https://" : "http://";
     }
 
     /**