diff --git a/app/controllers/activity_pubs_controller.rb b/app/controllers/activity_pubs_controller.rb
index 37702d96..2b54cacd 100644
--- a/app/controllers/activity_pubs_controller.rb
+++ b/app/controllers/activity_pubs_controller.rb
@@ -28,6 +28,20 @@ class ActivityPubsController < ApplicationController
 
     return unless ActivityPub.events.include? action
 
+    # Crear una sola remote flag por autore
+    if action == :report
+      message = remote_flag_params(activity_pubs.first).dig(:remote_flag_attributes, :message)
+
+      activity_pubs.distinct.pluck(:actor_id).each do |actor_id|
+        remote_flag = ActivityPub::RemoteFlag.find_or_initialize_by(actor_id: actor_id, site_id: site.id)
+        remote_flag.message = message
+        remote_flag.save
+        # XXX: Idealmente todas las ActivityPub que enviamos pueden
+        # cambiar de estado, pero chequeamos de todas formas.
+        remote_flag.activity_pubs << (activity_pubs.where(actor_id: actor_id).to_a.select { |a| a.public_send(may) })
+      end
+    end
+
     ActivityPub.transaction do
       activity_pubs.find_each do |activity_pub|
         next unless activity_pub.public_send(may)
diff --git a/app/controllers/concerns/moderation_concern.rb b/app/controllers/concerns/moderation_concern.rb
index 5b4c276d..3b9d818f 100644
--- a/app/controllers/concerns/moderation_concern.rb
+++ b/app/controllers/concerns/moderation_concern.rb
@@ -16,7 +16,7 @@ module ModerationConcern
     end
 
     def remote_flag_params(model)
-      { remote_flag_attributes: { id: model.remote_flag_id, message: '' } }.tap do |p|
+      { remote_flag_attributes: { id: model.remote_flag_id, message: ''.dup } }.tap do |p|
         p[:remote_flag_attributes][:site_id] = model.site_id
         p[:remote_flag_attributes][:actor_id] = model.actor_id