diff --git a/app/controllers/experiments_controller.rb b/app/controllers/experiments_controller.rb
index d7b833d0..d8011885 100644
--- a/app/controllers/experiments_controller.rb
+++ b/app/controllers/experiments_controller.rb
@@ -1,4 +1,4 @@
-require 'FileUtils'
+require 'fileutils'
 require 'modules/JSON_patch'
 
 class ExperimentsController < ApplicationController