diff --git a/themes/darkblue_orange/css/theme_right.css.php b/themes/darkblue_orange/css/theme_right.css.php
index cdc26d51a..f364a3cc2 100644
--- a/themes/darkblue_orange/css/theme_right.css.php
+++ b/themes/darkblue_orange/css/theme_right.css.php
@@ -15,7 +15,8 @@ if (!defined('PMA_MINIMUM_COMMON')) {
 /******************************************************************************/
 /* general tags */
 html {
-    font-size: <?php echo (null !== $GLOBALS['PMA_Config']->get('fontsize') ? $GLOBALS['PMA_Config']->get('fontsize') : $_COOKIE['pma_fontsize']); ?>;
+    font-size: <?php echo (null !== $GLOBALS['PMA_Config']->get('fontsize') ? $GLOBALS['PMA_Config']->get('fontsize') : (
+        isset($_COOKIE['pma_fontsize']) ? $_COOKIE['pma_fontsize'] : '82%'));?>;
 }
 
 input, select, textarea {