diff --git a/lib/pleroma/activity.ex b/lib/pleroma/activity.ex
index a35ccc9b4..afd09982f 100644
--- a/lib/pleroma/activity.ex
+++ b/lib/pleroma/activity.ex
@@ -7,7 +7,7 @@ defmodule Pleroma.Activity do
     field :data, :map
     field :local, :boolean, default: true
     field :actor, :string
-    has_many :notifications, Notification
+    has_many :notifications, Notification, on_delete: :delete_all
 
     timestamps()
   end