diff --git a/app/controllers/concerns/account_controller_concern.rb b/app/controllers/concerns/account_controller_concern.rb
index d63bcc85c95..b75f3e35819 100644
--- a/app/controllers/concerns/account_controller_concern.rb
+++ b/app/controllers/concerns/account_controller_concern.rb
@@ -20,7 +20,7 @@ module AccountControllerConcern
         webfinger_account_link,
         actor_url_link,
       ]
-    )
+    ).to_s
   end
 
   def webfinger_account_link
diff --git a/app/controllers/concerns/api/pagination.rb b/app/controllers/concerns/api/pagination.rb
index 7f06dc02023..b0b4ae4603f 100644
--- a/app/controllers/concerns/api/pagination.rb
+++ b/app/controllers/concerns/api/pagination.rb
@@ -19,7 +19,7 @@ module Api::Pagination
     links = []
     links << [next_path, [%w(rel next)]] if next_path
     links << [prev_path, [%w(rel prev)]] if prev_path
-    response.headers['Link'] = LinkHeader.new(links) unless links.empty?
+    response.headers['Link'] = LinkHeader.new(links).to_s unless links.empty?
   end
 
   def require_valid_pagination_options!
diff --git a/app/controllers/statuses_controller.rb b/app/controllers/statuses_controller.rb
index db7eddd78b3..a0885b469b2 100644
--- a/app/controllers/statuses_controller.rb
+++ b/app/controllers/statuses_controller.rb
@@ -56,7 +56,9 @@ class StatusesController < ApplicationController
   end
 
   def set_link_headers
-    response.headers['Link'] = LinkHeader.new([[ActivityPub::TagManager.instance.uri_for(@status), [%w(rel alternate), %w(type application/activity+json)]]])
+    response.headers['Link'] = LinkHeader.new(
+      [[ActivityPub::TagManager.instance.uri_for(@status), [%w(rel alternate), %w(type application/activity+json)]]]
+    ).to_s
   end
 
   def set_status