diff --git a/src/Symfony/Bridge/Doctrine/ContainerAwareEventManager.php b/src/Symfony/Bridge/Doctrine/ContainerAwareEventManager.php
index 9b3c1595a41f0..1ee4f54ded8e1 100644
--- a/src/Symfony/Bridge/Doctrine/ContainerAwareEventManager.php
+++ b/src/Symfony/Bridge/Doctrine/ContainerAwareEventManager.php
@@ -177,6 +177,7 @@ private function initializeSubscribers()
             if (!isset($this->listeners[$event])) {
                 $this->listeners[$event] = [];
             }
+            unset($this->initialized[$event]);
             $this->listeners[$event] += $listeners;
         }
         $this->subscribers = [];