diff --git a/htdocs/categories/categorie.class.php b/htdocs/categories/categorie.class.php
index b14fdf65865..103d0c943d7 100644
--- a/htdocs/categories/categorie.class.php
+++ b/htdocs/categories/categorie.class.php
@@ -153,6 +153,16 @@ class Categorie
    */
   function update()
   {
+   
+	$sql = 'delete from '.MAIN_DB_PREFIX.'categorie_association';
+    $sql .= ' WHERE fk_categorie_fille = "'.$this->id.'"';
+
+    if (! $this->db->query($sql))
+    {
+	    dolibarr_print_error($this->db);
+	     return -1;
+    }
+
 	
 	if($this->id_mere !="" && $this->id_mere!=$this->id)
 	{