diff --git a/Rakefile b/Rakefile
index f7084da..02df13b 100644
--- a/Rakefile
+++ b/Rakefile
@@ -341,8 +341,9 @@ task :setup_github_pages, :repo do |t, args|
       end
     end
   end
+  url = blog_url(user, project)
   jekyll_config = IO.read('_config.yml')
-  jekyll_config.sub!(/^url:.*$/, "url: #{blog_url(user, project)}")
+  jekyll_config.sub!(/^url:.*$/, "url: #{url}")
   File.open('_config.yml', 'w') do |f|
     f.write jekyll_config
   end
@@ -391,7 +392,7 @@ def blog_url(user, project)
   url = if File.exists?('source/CNAME')
     "http://#{IO.read('source/CNAME').strip}"
   else
-    "http://#{user}.github.io"
+    "http://#{user.downcase}.github.io"
   end
   url += "/#{project}" unless project == ''
   url