diff --git a/app/logical/note_sanitizer.rb b/app/logical/note_sanitizer.rb
index 099a161b8..ed319aa08 100644
--- a/app/logical/note_sanitizer.rb
+++ b/app/logical/note_sanitizer.rb
@@ -84,7 +84,7 @@ module NoteSanitizer
 
     url = Addressable::URI.heuristic_parse(node["href"]).normalize
 
-    if url.authority.in?(Danbooru.config.hostnames)
+    if url.authority == Danbooru.config.hostname
       url.site = nil
       node["href"] = url.to_s
     end
diff --git a/config/danbooru_default_config.rb b/config/danbooru_default_config.rb
index e3ac485b2..d0ad440fe 100644
--- a/config/danbooru_default_config.rb
+++ b/config/danbooru_default_config.rb
@@ -34,12 +34,6 @@ module Danbooru
       Socket.gethostname
     end
 
-    # The list of all domain names this site is accessible under.
-    # Example: %w[danbooru.donmai.us sonohara.donmai.us hijiribe.donmai.us safebooru.donmai.us]
-    def hostnames
-      [hostname]
-    end
-
     # Contact email address of the admin.
     def contact_email
       "webmaster@#{server_host}"
diff --git a/test/unit/note_sanitizer_test.rb b/test/unit/note_sanitizer_test.rb
index 4301304ee..37d4519c8 100644
--- a/test/unit/note_sanitizer_test.rb
+++ b/test/unit/note_sanitizer_test.rb
@@ -23,7 +23,7 @@ class NoteSanitizerTest < ActiveSupport::TestCase
     end
 
     should "rewrite absolute links to relative links" do
-      Danbooru.config.stubs(:hostnames).returns(%w[danbooru.donmai.us sonohara.donmai.us hijiribe.donmai.us])
+      Danbooru.config.stubs(:hostname).returns("sonohara.donmai.us")
 
       body = '<a href="http://sonohara.donmai.us/posts?tags=touhou#dtext-intro">touhou</a>'
       assert_equal('<a href="/posts?tags=touhou#dtext-intro" rel="external noreferrer nofollow">touhou</a>', NoteSanitizer.sanitize(body))