diff --git a/app/jobs/activity_pub/instance_moderation_job.rb b/app/jobs/activity_pub/instance_moderation_job.rb
index 00100abf..9da0627f 100644
--- a/app/jobs/activity_pub/instance_moderation_job.rb
+++ b/app/jobs/activity_pub/instance_moderation_job.rb
@@ -9,7 +9,7 @@ class ActivityPub
     def perform(site:, hostnames:, perform_remotely: true)
       # Crear las instancias que no existan todavía
       hostnames.each do |hostname|
-        ActivityPub::Instance.find_or_create_by(hostname: hostname)
+        ActivityPub::Instance.lock.find_or_create_by(hostname: hostname)
       end
 
       instances = ActivityPub::Instance.where(hostname: hostnames)
@@ -20,7 +20,7 @@ class ActivityPub
         instances.find_each do |instance|
           # Esto bloquea cada una individualmente en la Social Inbox,
           # idealmente son pocas instancias las que aparecen.
-          site.instance_moderations.find_or_create_by(instance: instance)
+          site.instance_moderations.lock.find_or_create_by(instance: instance)
         end
 
         scope = site.instance_moderations.where(instance_id: instances.ids)