diff --git a/app/workers/maintenance/uncache_media_worker.rb b/app/workers/maintenance/uncache_media_worker.rb
index 4bc62ef755..2d1a670a76 100644
--- a/app/workers/maintenance/uncache_media_worker.rb
+++ b/app/workers/maintenance/uncache_media_worker.rb
@@ -6,7 +6,7 @@ class Maintenance::UncacheMediaWorker
   sidekiq_options queue: 'pull'
 
   def perform(media_attachment_id)
-    media = media_attachment_id.is_a?(MediaAttachment) ? media_attachment_id : MediaAttachment.find(media_attachment_id)
+    media = MediaAttachment.find(media_attachment_id)
 
     return if media.file.blank?
 
diff --git a/lib/mastodon/media_cli.rb b/lib/mastodon/media_cli.rb
index ee28270da7..f9204395f5 100644
--- a/lib/mastodon/media_cli.rb
+++ b/lib/mastodon/media_cli.rb
@@ -34,7 +34,7 @@ module Mastodon
           Maintenance::UncacheMediaWorker.push_bulk(media_attachments.map(&:id))
         else
           media_attachments.each do |m|
-            Maintenance::UncacheMediaWorker.new.perform(m)
+            Maintenance::UncacheMediaWorker.new.perform(m.id)
             say('.', :green, false)
             processed += 1
           end