diff --git a/mail/inc/class.mail_ui.inc.php b/mail/inc/class.mail_ui.inc.php
index 25c52bdbd3..6046489ac2 100644
--- a/mail/inc/class.mail_ui.inc.php
+++ b/mail/inc/class.mail_ui.inc.php
@@ -2637,10 +2637,10 @@ $filter['before']= date("d-M-Y", $cutoffdate2);
 			$text = $usage .'/'.$limit;
 			switch ($percent)
 			{
-				case 90:
+				case ($percent > 90):
 					$class ='mail-index_QuotaRed';
 					break;
-				case 80:
+				case ($percent > 80):
 					$class ='mail-index_QuotaYellow';
 					break;
 				default: