diff --git a/htdocs/admin/agenda_other.php b/htdocs/admin/agenda_other.php
index c1f77f4995e..a072869be8c 100644
--- a/htdocs/admin/agenda_other.php
+++ b/htdocs/admin/agenda_other.php
@@ -51,6 +51,7 @@ $type = 'action';
 
 include DOL_DOCUMENT_ROOT.'/core/actions_setmoduleoptions.inc.php';
 
+$reg = array();
 if (preg_match('/set_([a-z0-9_\-]+)/i', $action, $reg))
 {
 	$code = $reg[1];