diff --git a/htdocs/core/lib/usergroups.lib.php b/htdocs/core/lib/usergroups.lib.php
index 3dceff310099e1ef6e18eca8bb52e75e3f3b5020..5dc17962e145760b0b28ad23a3e49bd4df7b0ea0 100644
--- a/htdocs/core/lib/usergroups.lib.php
+++ b/htdocs/core/lib/usergroups.lib.php
@@ -257,6 +257,8 @@ function show_theme($fuser,$edit=0,$foruserprofile=false)
     global $conf,$langs,$db;
     global $bc;
 
+	require_once DOL_DOCUMENT_ROOT . '/core/class/html.formother.class.php';
+
     $formother = new FormOther($db);
 
     //$dirthemes=array(empty($conf->global->MAIN_FORCETHEMEDIR)?'/theme':$conf->global->MAIN_FORCETHEMEDIR.'/theme');