diff --git a/app/services/suspend_account_service.rb b/app/services/suspend_account_service.rb
index e79c2d3d8..65743e360 100644
--- a/app/services/suspend_account_service.rb
+++ b/app/services/suspend_account_service.rb
@@ -95,7 +95,7 @@ class SuspendAccountService < BaseService
             end
           end
 
-          CacheBusterWorker.perform_async(attachment.path(style)) if Rails.configuration.x.cache_buster_enabled
+          CacheBusterWorker.perform_async(attachment.url(style)) if Rails.configuration.x.cache_buster_enabled
         end
       end
     end
diff --git a/app/services/unsuspend_account_service.rb b/app/services/unsuspend_account_service.rb
index 93cd04a94..eec570db5 100644
--- a/app/services/unsuspend_account_service.rb
+++ b/app/services/unsuspend_account_service.rb
@@ -91,7 +91,7 @@ class UnsuspendAccountService < BaseService
             end
           end
 
-          CacheBusterWorker.perform_async(attachment.path(style)) if Rails.configuration.x.cache_buster_enabled
+          CacheBusterWorker.perform_async(attachment.url(style)) if Rails.configuration.x.cache_buster_enabled
         end
       end
     end
diff --git a/spec/services/suspend_account_service_spec.rb b/spec/services/suspend_account_service_spec.rb
index edb705008..8044730e6 100644
--- a/spec/services/suspend_account_service_spec.rb
+++ b/spec/services/suspend_account_service_spec.rb
@@ -3,6 +3,13 @@
 require 'rails_helper'
 
 RSpec.describe SuspendAccountService, type: :service do
+  around do |example|
+    Sidekiq::Testing.fake! do
+      example.run
+      Sidekiq::Worker.clear_all
+    end
+  end
+
   shared_examples 'common behavior' do
     subject { described_class.new.call(account) }
 
@@ -11,15 +18,20 @@ RSpec.describe SuspendAccountService, type: :service do
 
     before do
       allow(FeedManager.instance).to receive_messages(unmerge_from_home: nil, unmerge_from_list: nil)
+      allow(Rails.configuration.x).to receive(:cache_buster_enabled).and_return(true)
 
       local_follower.follow!(account)
       list.accounts << account
 
       account.suspend!
+
+      Fabricate(:media_attachment, file: attachment_fixture('boop.ogg'), account: account)
     end
 
-    it "unmerges from local followers' feeds" do
-      subject
+    it 'unmerges from feeds of local followers and changes file mode' do
+      expect { subject }
+        .to change { File.stat(account.media_attachments.first.file.path).mode }
+        .and enqueue_sidekiq_job(CacheBusterWorker).with(account.media_attachments.first.file.url(:original))
       expect(FeedManager.instance).to have_received(:unmerge_from_home).with(account, local_follower)
       expect(FeedManager.instance).to have_received(:unmerge_from_list).with(account, list)
     end
@@ -30,17 +42,12 @@ RSpec.describe SuspendAccountService, type: :service do
   end
 
   describe 'suspending a local account' do
-    def match_update_actor_request(req, account)
-      json = JSON.parse(req.body)
+    def match_update_actor_request(json, account)
+      json = JSON.parse(json)
       actor_id = ActivityPub::TagManager.instance.uri_for(account)
       json['type'] == 'Update' && json['actor'] == actor_id && json['object']['id'] == actor_id && json['object']['suspended']
     end
 
-    before do
-      stub_request(:post, 'https://alice.com/inbox').to_return(status: 201)
-      stub_request(:post, 'https://bob.com/inbox').to_return(status: 201)
-    end
-
     include_examples 'common behavior' do
       let!(:account)         { Fabricate(:account) }
       let!(:remote_follower) { Fabricate(:account, uri: 'https://alice.com', inbox_url: 'https://alice.com/inbox', protocol: :activitypub, domain: 'alice.com') }
@@ -53,22 +60,21 @@ RSpec.describe SuspendAccountService, type: :service do
 
       it 'sends an update actor to followers and reporters' do
         subject
-        expect(a_request(:post, remote_follower.inbox_url).with { |req| match_update_actor_request(req, account) }).to have_been_made.once
-        expect(a_request(:post, remote_reporter.inbox_url).with { |req| match_update_actor_request(req, account) }).to have_been_made.once
+
+        expect(ActivityPub::DeliveryWorker)
+          .to have_enqueued_sidekiq_job(satisfying { |json| match_update_actor_request(json, account) }, account.id, remote_follower.inbox_url)
+        expect(ActivityPub::DeliveryWorker)
+          .to have_enqueued_sidekiq_job(satisfying { |json| match_update_actor_request(json, account) }, account.id, remote_reporter.inbox_url)
       end
     end
   end
 
   describe 'suspending a remote account' do
-    def match_reject_follow_request(req, account, followee)
-      json = JSON.parse(req.body)
+    def match_reject_follow_request(json, account, followee)
+      json = JSON.parse(json)
       json['type'] == 'Reject' && json['actor'] == ActivityPub::TagManager.instance.uri_for(followee) && json['object']['actor'] == account.uri
     end
 
-    before do
-      stub_request(:post, 'https://bob.com/inbox').to_return(status: 201)
-    end
-
     include_examples 'common behavior' do
       let!(:account)        { Fabricate(:account, domain: 'bob.com', uri: 'https://bob.com', inbox_url: 'https://bob.com/inbox', protocol: :activitypub) }
       let!(:local_followee) { Fabricate(:account) }
@@ -79,7 +85,9 @@ RSpec.describe SuspendAccountService, type: :service do
 
       it 'sends a reject follow' do
         subject
-        expect(a_request(:post, account.inbox_url).with { |req| match_reject_follow_request(req, account, local_followee) }).to have_been_made.once
+
+        expect(ActivityPub::DeliveryWorker)
+          .to have_enqueued_sidekiq_job(satisfying { |json| match_reject_follow_request(json, account, local_followee) }, local_followee.id, account.inbox_url)
       end
     end
   end