diff --git a/library/Icinga/Chart/Donut.php b/library/Icinga/Chart/Donut.php
index 8e6c58920..d509a3356 100644
--- a/library/Icinga/Chart/Donut.php
+++ b/library/Icinga/Chart/Donut.php
@@ -366,7 +366,7 @@ class Donut
     protected function shortenLabel($label)
     {
         if (is_numeric($label) && strlen($label) > 3) {
-            return '~' . substr(round($label, -3), 0, 1) . 'k';
+            return round($label, -3)/1000 . 'k';
         }
 
         return $label;