diff --git a/lib/federation/activity_pub/types/actors.ex b/lib/federation/activity_pub/types/actors.ex
index 0ea7cb06f..253e9f159 100644
--- a/lib/federation/activity_pub/types/actors.ex
+++ b/lib/federation/activity_pub/types/actors.ex
@@ -92,7 +92,10 @@ defmodule Mobilizon.Federation.ActivityPub.Types.Actors do
     activity_data = %{
       "type" => "Delete",
       "actor" => actor_url,
-      "object" => Convertible.model_to_as(target_actor),
+      "object" => %{
+        "type" => "Tombstone",
+        "id" => target_actor_url
+      },
       "id" => target_actor_url <> "/delete",
       "to" => to,
       "cc" => cc
diff --git a/lib/federation/activity_pub/types/comments.ex b/lib/federation/activity_pub/types/comments.ex
index c8794b9a3..e510a537f 100644
--- a/lib/federation/activity_pub/types/comments.ex
+++ b/lib/federation/activity_pub/types/comments.ex
@@ -82,7 +82,10 @@ defmodule Mobilizon.Federation.ActivityPub.Types.Comments do
     activity_data = %{
       "type" => "Delete",
       "actor" => actor.url,
-      "object" => Convertible.model_to_as(comment),
+      "object" => %{
+        "type" => "Tombstone",
+        "id" => url
+      },
       "id" => url <> "/delete",
       "to" => ["https://www.w3.org/ns/activitystreams#Public"]
     }
diff --git a/lib/federation/activity_pub/types/discussions.ex b/lib/federation/activity_pub/types/discussions.ex
index ec82e0937..2644fb7ef 100644
--- a/lib/federation/activity_pub/types/discussions.ex
+++ b/lib/federation/activity_pub/types/discussions.ex
@@ -115,7 +115,10 @@ defmodule Mobilizon.Federation.ActivityPub.Types.Discussions do
         activity_data = %{
           "type" => "Delete",
           "actor" => actor.url,
-          "object" => Convertible.model_to_as(discussion),
+          "object" => %{
+            "type" => "Tombstone",
+            "url" => url
+          },
           "id" => url <> "/delete",
           "to" => [group.members_url]
         }
diff --git a/lib/federation/activity_pub/types/events.ex b/lib/federation/activity_pub/types/events.ex
index 0fdd3f32d..a23139fe3 100644
--- a/lib/federation/activity_pub/types/events.ex
+++ b/lib/federation/activity_pub/types/events.ex
@@ -73,7 +73,10 @@ defmodule Mobilizon.Federation.ActivityPub.Types.Events do
     activity_data = %{
       "type" => "Delete",
       "actor" => actor.url,
-      "object" => Convertible.model_to_as(event),
+      "object" => %{
+        "type" => "Tombstone",
+        "id" => url
+      },
       "to" => [actor.url <> "/followers", "https://www.w3.org/ns/activitystreams#Public"],
       "id" => url <> "/delete"
     }
diff --git a/lib/federation/activity_pub/types/posts.ex b/lib/federation/activity_pub/types/posts.ex
index 1bca51fee..ed7642fbd 100644
--- a/lib/federation/activity_pub/types/posts.ex
+++ b/lib/federation/activity_pub/types/posts.ex
@@ -77,7 +77,10 @@ defmodule Mobilizon.Federation.ActivityPub.Types.Posts do
     activity_data = %{
       "actor" => actor_url,
       "type" => "Delete",
-      "object" => Convertible.model_to_as(post),
+      "object" => %{
+        "type" => "Tombstone",
+        "id" => url
+      },
       "id" => url <> "/delete",
       "to" => [group_url, @public_ap, members_url]
     }
diff --git a/lib/federation/activity_pub/types/resources.ex b/lib/federation/activity_pub/types/resources.ex
index 9d5438b78..a6d965922 100644
--- a/lib/federation/activity_pub/types/resources.ex
+++ b/lib/federation/activity_pub/types/resources.ex
@@ -161,7 +161,10 @@ defmodule Mobilizon.Federation.ActivityPub.Types.Resources do
       "actor" => actor_url,
       "attributedTo" => [group_url],
       "type" => "Delete",
-      "object" => Convertible.model_to_as(resource),
+      "object" => %{
+        "type" => "Tombstone",
+        "id" => url
+      },
       "id" => url <> "/delete",
       "to" => [members_url]
     }
diff --git a/lib/federation/activity_pub/types/todo_lists.ex b/lib/federation/activity_pub/types/todo_lists.ex
index fc2fa1bdc..c0b288afa 100644
--- a/lib/federation/activity_pub/types/todo_lists.ex
+++ b/lib/federation/activity_pub/types/todo_lists.ex
@@ -55,7 +55,10 @@ defmodule Mobilizon.Federation.ActivityPub.Types.TodoLists do
     activity_data = %{
       "actor" => actor_url,
       "type" => "Delete",
-      "object" => Convertible.model_to_as(todo_list),
+      "object" => %{
+        "type" => "Tombstone",
+        "id" => url
+      },
       "id" => url <> "/delete",
       "to" => [group_url]
     }
diff --git a/lib/federation/activity_pub/types/todos.ex b/lib/federation/activity_pub/types/todos.ex
index 771b64863..0e97835e1 100644
--- a/lib/federation/activity_pub/types/todos.ex
+++ b/lib/federation/activity_pub/types/todos.ex
@@ -95,7 +95,10 @@ defmodule Mobilizon.Federation.ActivityPub.Types.Todos do
     activity_data = %{
       "actor" => actor_url,
       "type" => "Delete",
-      "object" => Convertible.model_to_as(url),
+      "object" => %{
+        "type" => "Tombstone",
+        "id" => url
+      },
       "id" => "#{url}/delete",
       "to" => [group_url]
     }
diff --git a/test/federation/activity_pub/activity_pub_test.exs b/test/federation/activity_pub/activity_pub_test.exs
index 59e6986d5..e5344ecee 100644
--- a/test/federation/activity_pub/activity_pub_test.exs
+++ b/test/federation/activity_pub/activity_pub_test.exs
@@ -121,7 +121,7 @@ defmodule Mobilizon.Federation.ActivityPubTest do
 
       assert delete.data["type"] == "Delete"
       assert delete.data["actor"] == event.organizer_actor.url
-      assert delete.data["object"]["type"] == "Event"
+      assert delete.data["object"]["type"] == "Tombstone"
       assert delete.data["object"]["id"] == event.url
 
       assert Events.get_event_by_url(event.url) == nil
@@ -137,7 +137,7 @@ defmodule Mobilizon.Federation.ActivityPubTest do
 
         assert delete.data["type"] == "Delete"
         assert delete.data["actor"] == event.organizer_actor.url
-        assert delete.data["object"]["type"] == "Event"
+        assert delete.data["object"]["type"] == "Tombstone"
         assert delete.data["object"]["id"] == event.url
         assert delete.local == false
 
@@ -155,7 +155,7 @@ defmodule Mobilizon.Federation.ActivityPubTest do
 
       assert delete.data["type"] == "Delete"
       assert delete.data["actor"] == comment.actor.url
-      assert delete.data["object"]["type"] == "Note"
+      assert delete.data["object"]["type"] == "Tombstone"
       assert delete.data["object"]["id"] == comment.url
 
       refute is_nil(Discussions.get_comment_from_url(comment.url).deleted_at)
@@ -486,7 +486,7 @@ defmodule Mobilizon.Federation.ActivityPubTest do
 
         assert update_data.local
         assert update_data.data["type"] == "Delete"
-        assert update_data.data["object"]["type"] == "Document"
+        assert update_data.data["object"]["type"] == "Tombstone"
         assert update_data.data["object"]["id"] == url
         assert update_data.data["to"] == [group.members_url]
         assert update_data.data["actor"] == actor.url