diff --git a/app/models/post.rb b/app/models/post.rb
index f5f9a924a..3dc7e6be5 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -353,7 +353,7 @@ class Post < ActiveRecord::Base
       when %r{\Ahttps?://(?:fbcdn-)?s(?:content|photos)-[^/]+\.(?:fbcdn|akamaihd)\.net/hphotos-.+/\d+_(\d+)_(?:\d+_){1,3}[no]\.}i
         "https://www.facebook.com/photo.php?fbid=#{$1}"
 
-      when %r{\Ahttp://c(?:s|han|[1-4])\.sankakucomplex\.com/data(?:/sample)?/(?:[a-f0-9]{2}/){2}(?:sample-|preview)?([a-f0-9]{32})}i
+      when %r{\Ahttps?://c(?:s|han|[1-4])\.sankakucomplex\.com/data(?:/sample)?/(?:[a-f0-9]{2}/){2}(?:sample-|preview)?([a-f0-9]{32})}i
         "http://chan.sankakucomplex.com/en/post/show?md5=#{$1}"
 
       when %r{\Ahttp://s(?:tatic|[1-4])\.zerochan\.net/.+(?:\.|\/)(\d+)\.(?:jpe?g?)\z}i