diff --git a/app/models/tag.rb b/app/models/tag.rb
index eb13f5b64..7da5b672e 100644
--- a/app/models/tag.rb
+++ b/app/models/tag.rb
@@ -161,7 +161,7 @@ class Tag < ActiveRecord::Base
 
   module ParseMethods
     def normalize(query)
-      query.to_s.downcase.strip
+      query.to_s.strip
     end
 
     def scan_query(query)
diff --git a/app/presenters/post_set_presenters/post.rb b/app/presenters/post_set_presenters/post.rb
index c24c9c7dc..86a0f7f0c 100644
--- a/app/presenters/post_set_presenters/post.rb
+++ b/app/presenters/post_set_presenters/post.rb
@@ -44,7 +44,7 @@ module PostSetPresenters
     end
 
     def related_tags_for_single
-      tag = Tag.find_by_name(post_set.tag_string)
+      tag = Tag.find_by_name(post_set.tag_string.downcase)
 
       if tag
         tag.related_tag_array.map(&:first)