diff --git a/app/classes/Framadate/Utils.php b/app/classes/Framadate/Utils.php
index f7003ba434d5d8ab4337f36004fdba7bdcff2823..de32dc1dc1573c0d5e643a9b839fee99b80fe329 100644
--- a/app/classes/Framadate/Utils.php
+++ b/app/classes/Framadate/Utils.php
@@ -191,7 +191,7 @@ class Utils {
     }
 
     public static function htmlMailEscape($html) {
-        return htmlspecialchars($html, ENT_HTML5 | ENT_QUOTES, 'UTF-8');
+        return htmlspecialchars($html, ENT_HTML5 | ENT_QUOTES);
     }
 
     public static function csvEscape($text) {