diff --git a/htdocs/categories/edit.php b/htdocs/categories/edit.php
index b420847f6fd..1cde5e62adc 100644
--- a/htdocs/categories/edit.php
+++ b/htdocs/categories/edit.php
@@ -35,7 +35,7 @@ $langs->load("categories");
 $id=GETPOST('id','int');
 $ref=GETPOST('ref');
 $type=GETPOST('type');
-$action=GETPOST('action','aZ09');
+$action=(GETPOST('action','aZ09')?GETPOST('action','aZ09'):'edit');
 $confirm=GETPOST('confirm');
 $cancel=GETPOST('cancel','alpha');