diff --git a/boot.php b/boot.php
index fbef7fa34..57b8716f6 100644
--- a/boot.php
+++ b/boot.php
@@ -1480,7 +1480,7 @@ if(! function_exists('current_theme')) {
 				$theme_name = '';
 			}
 			else {
-				$system_theme = ((isset($a->config['system']['mobile-theme'])) ? $a->config['system']['mobile-theme'] : '');
+				$system_theme = ((isset($a->config['system']['mobile-theme'])) ? $a->config['system']['mobile-theme'] : $standard_system_theme);
 				$theme_name = ((isset($_SESSION) && x($_SESSION,'mobile-theme')) ? $_SESSION['mobile-theme'] : $system_theme);
 
 				if($theme_name === '---') {