diff --git a/app/models/artist_url.rb b/app/models/artist_url.rb
index 575deb933..fc860f403 100644
--- a/app/models/artist_url.rb
+++ b/app/models/artist_url.rb
@@ -19,6 +19,21 @@ class ArtistUrl < ActiveRecord::Base
     end
   end
 
+  def self.legacy_normalize(url)
+    if url.nil?
+      nil
+    else
+      url = url.gsub(/^https:\/\//, "http://")
+      url = url.gsub(/^http:\/\/blog\d+\.fc2/, "http://blog.fc2")
+      url = url.gsub(/^http:\/\/blog-imgs-\d+\.fc2/, "http://blog.fc2")
+      url = url.gsub(/^http:\/\/blog-imgs-\d+-\w+\.fc2/, "http://blog.fc2")
+      url = url.gsub(/^http:\/\/img\d+\.pixiv\.net/, "http://img.pixiv.net")
+      url = url.gsub(/^http:\/\/i\d+\.pixiv\.net\/img\d+/, "http://img.pixiv.net")
+      url = url.gsub(/\/+\Z/, "")
+      url + "/"
+    end
+  end
+
   def self.normalize_for_search(url)
     if url =~ /\.\w+\Z/ && url =~ /\w\/\w/
       url = File.dirname(url)
diff --git a/app/models/artist_version.rb b/app/models/artist_version.rb
index 484aad7dd..2047bd5e3 100644
--- a/app/models/artist_version.rb
+++ b/app/models/artist_version.rb
@@ -69,8 +69,8 @@ class ArtistVersion < ActiveRecord::Base
     new_urls = url_array
     old_urls = version.present? ? version.url_array : []
 
-    new_urls = new_urls.map {|url| ArtistUrl.normalize(url)}
-    old_urls = old_urls.map {|url| ArtistUrl.normalize(url)}
+    new_urls = new_urls.map {|url| ArtistUrl.legacy_normalize(url)}
+    old_urls = old_urls.map {|url| ArtistUrl.legacy_normalize(url)}
 
     return {
       :added_urls => new_urls - old_urls,