diff --git a/Rakefile b/Rakefile
index a30a6f8a3d9..177a9e9c44a 100644
--- a/Rakefile
+++ b/Rakefile
@@ -387,7 +387,7 @@ 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