diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index 3466625dfe5..0087be5eab5 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -3612,31 +3612,6 @@ class Product extends CommonObject
     }
 
 
-    // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
-    /**
-     *  copy related categories to another product
-     *
-     * @param  int $fromId Id produit source
-     * @param  int $toId   Id produit cible
-     * @return int                 < 0 si erreur, > 0 si ok
-     */
-	function clone_categories($fromId, $toId)
-	{
-		$this->db->begin();
-
-		$sql = 'INSERT INTO '.MAIN_DB_PREFIX.'categorie_product (fk_categorie, fk_product)';
-		$sql.= " SELECT fk_categorie, $toId FROM ".MAIN_DB_PREFIX."categorie_product";
-		$sql.= " WHERE fk_product = '".$fromId."'";
-
-		if (! $this->db->query($sql))
-		{
-			$this->db->rollback();
-			return -1;
-		}
-
-		$this->db->commit();
-		return 1;
-	}
     // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
     /**
      *  Recopie les fournisseurs et prix fournisseurs d'un produit/service sur un autre