diff --git a/lib/pleroma/web/activity_pub/object_validators/delete_validator.ex b/lib/pleroma/web/activity_pub/object_validators/delete_validator.ex
index 68ab08605..e06de3dff 100644
--- a/lib/pleroma/web/activity_pub/object_validators/delete_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/delete_validator.ex
@@ -20,7 +20,7 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.DeleteValidator do
     field(:actor, Types.ObjectID)
     field(:to, Types.Recipients, default: [])
     field(:cc, Types.Recipients, default: [])
-    field(:deleted_activity_id)
+    field(:deleted_activity_id, Types.ObjectID)
     field(:object, Types.ObjectID)
   end