diff --git a/inc/formanswer.class.php b/inc/formanswer.class.php
index 1c9873d91..9fcde93f4 100644
--- a/inc/formanswer.class.php
+++ b/inc/formanswer.class.php
@@ -940,12 +940,16 @@ public function prepareInputForUpdate($input) {
     * @return boolean true if pre_delete actions succeeded, false if not
     */
    public function pre_deleteItem() {
+      global $CFG_GLPI;
+
       $issue = new PluginFormcreatorIssue();
       $issue->deleteByCriteria([
          'items_id'    => $this->getID(),
          'itemtype'    => self::getType(),
       ]);
 
+      $CFG_GLPI['keep_tickets_on_delete'] = '1';
+
       return true;
    }