diff --git a/inc/planningexternalevent.class.php b/inc/planningexternalevent.class.php
index 2f6ccee..d27edd8 100644
--- a/inc/planningexternalevent.class.php
+++ b/inc/planningexternalevent.class.php
@@ -758,6 +758,13 @@ static function activityUpdate(PlanningExternalEvent $item)
 
         self::prepareInputToUpdateWithPluginOptions($item);
         self::setActivity($item);
+
+        $plugin = new Plugin();
+        if ($plugin->isActivated('planningoptions')) {
+            include_once(PLUGIN_PLANNINGOPTIONS_DIR . "/inc/config.class.php");
+            $config = PluginPlanningOptionsConfig::getInstance();
+            $config->includeRruleUntilDateBack($item);
+        }
     }
 
     static function activityAdd(PlanningExternalEvent $item)