diff --git a/src/Bundle/ChillMainBundle/Entity/Notification.php b/src/Bundle/ChillMainBundle/Entity/Notification.php
index 76a4b1e4c..51ea0e39f 100644
--- a/src/Bundle/ChillMainBundle/Entity/Notification.php
+++ b/src/Bundle/ChillMainBundle/Entity/Notification.php
@@ -27,7 +27,12 @@ use Doctrine\ORM\Mapping as ORM;
 
 /**
  * @ORM\Entity(repositoryClass=NotificationRepository::class)
- * @ORM\Table(name="chill_main_notification")
+ * @ORM\Table(
+ *      name="chill_main_notification",
+ *      uniqueConstraints={
+ *          @ORM\UniqueConstraint(columns={"relatedEntityClass", "relatedEntityId"})
+ *      }
+ * )
  */
 class Notification
 {