diff --git a/control/Director.php b/control/Director.php
index b9c06a469..23316cd90 100644
--- a/control/Director.php
+++ b/control/Director.php
@@ -375,7 +375,7 @@ class Director implements TemplateGlobalProvider {
 	 */
 	static function protocol() {
 		if(isset($_SERVER['HTTP_X_FORWARDED_PROTOCOL']) && strtolower($_SERVER['HTTP_X_FORWARDED_PROTOCOL']) == 'https') return "https://";
-		return (isset($_SERVER['SSL']) || (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off')) ? 'https://' : 'http://';
+		return (isset($_SERVER['SSL']) || (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off')) ? 'https://' : 'http://';
 	}
 
 	/**