diff --git a/modules_v2/tree/module.php b/modules_v2/tree/module.php
index <HASH>..<HASH> 100644
--- a/modules_v2/tree/module.php
+++ b/modules_v2/tree/module.php
@@ -126,6 +126,7 @@ class tree_WT_Module extends WT_Module implements WT_Module_Tab {
         break;
 
       case 'getDetails':
+				header('Content-Type: text/html; charset=UTF-8');
         $pid = safe_GET('pid');
         $i = safe_GET('instance');
         $tv = new TreeView($i);
#<I> - German Umlaut Problem in interactive tree