diff --git a/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex b/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
index 14f51e2c5..398020bff 100644
--- a/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
@@ -45,9 +45,9 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.AttachmentValidator do
 
     struct
     |> cast(data, [:id, :type, :mediaType, :name, :blurhash])
-    |> cast_embed(:url, with: &url_changeset/2)
+    |> cast_embed(:url, with: &url_changeset/2, required: true)
     |> validate_inclusion(:type, ~w[Link Document Audio Image Video])
-    |> validate_required([:type, :mediaType, :url])
+    |> validate_required([:type, :mediaType])
   end
 
   def url_changeset(struct, data) do
@@ -91,6 +91,6 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.AttachmentValidator do
   defp validate_data(cng) do
     cng
     |> validate_inclusion(:type, ~w[Document Audio Image Video])
-    |> validate_required([:mediaType, :url, :type])
+    |> validate_required([:mediaType, :type])
   end
 end
diff --git a/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs b/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
index 9a17e277e..77f2044e9 100644
--- a/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
@@ -11,6 +11,19 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.AttachmentValidatorTest do
   import Pleroma.Factory
 
   describe "attachments" do
+    test "fails without url" do
+      attachment = %{
+        "mediaType" => "",
+        "name" => "",
+        "summary" => "298p3RG7j27tfsZ9RQ.jpg",
+        "type" => "Document"
+      }
+
+      assert {:error, _cng} =
+               AttachmentValidator.cast_and_validate(attachment)
+               |> Ecto.Changeset.apply_action(:insert)
+    end
+
     test "works with honkerific attachments" do
       attachment = %{
         "mediaType" => "",