diff --git a/app/models/artist_url.rb b/app/models/artist_url.rb
index ba0dfb48c..a28e8acb7 100644
--- a/app/models/artist_url.rb
+++ b/app/models/artist_url.rb
@@ -72,7 +72,7 @@ class ArtistURL < ApplicationRecord
   end
 
   def domain
-    Danbooru::URL.parse(normalized_url)&.domain
+    Danbooru::URL.parse(normalized_url)&.domain.to_s
   end
 
   def site_name