diff --git a/themes/original/css/theme_right.css.php b/themes/original/css/theme_right.css.php
index 078e978e1..6f6c3ae5b 100644
--- a/themes/original/css/theme_right.css.php
+++ b/themes/original/css/theme_right.css.php
@@ -16,7 +16,8 @@ if (!defined('PMA_MINIMUM_COMMON')) {
 /******************************************************************************/
 /* general tags */
 html {
-    font-size: <?php echo (null !== $_SESSION['PMA_Config']->get('fontsize') ? $_SESSION['PMA_Config']->get('fontsize') : $_COOKIE['pma_fontsize']);?>;
+    font-size: <?php echo (null !== $_SESSION['PMA_Config']->get('fontsize') ? $_SESSION['PMA_Config']->get('fontsize') : (
+        isset($_COOKIE['pma_fontsize'])) ? $_COOKIE['pma_fontsize'] : '84%');?>;
 }
 
 input, select, textarea {