diff --git a/kaminari-core/lib/generators/kaminari/views_generator.rb b/kaminari-core/lib/generators/kaminari/views_generator.rb
index 6ac2daaef..9a8bb8667 100644
--- a/kaminari-core/lib/generators/kaminari/views_generator.rb
+++ b/kaminari-core/lib/generators/kaminari/views_generator.rb
@@ -110,6 +110,8 @@ def templates_for(template_engine) #:nodoc:
     end
 
     module GitHubApiHelper
+      require 'open-uri'
+
       def get_files_in_master
         master_tree_sha = open('https://api.github.com/repos/amatsuda/kaminari_themes/git/refs/heads/master') do |json|
           ActiveSupport::JSON.decode(json.read)['object']['sha']