diff --git a/Classes/Domain/Service/ValueService.php b/Classes/Domain/Service/ValueService.php
index 307c0f1..023c361 100644
--- a/Classes/Domain/Service/ValueService.php
+++ b/Classes/Domain/Service/ValueService.php
@@ -177,6 +177,6 @@ protected function shortenString($string, $length = '30', $append = '...')
         if (strlen($string) <= $length) {
             return $string;
         }
-        return substr($string, 0, $length).$append;
+        return mb_substr($string, 0, $length).$append;
     }
 }