diff --git a/railties/lib/rails/paths.rb b/railties/lib/rails/paths.rb
index <HASH>..<HASH> 100644
--- a/railties/lib/rails/paths.rb
+++ b/railties/lib/rails/paths.rb
@@ -1,5 +1,3 @@
-require 'set'
-
 module Rails
   module Paths
     # This object is an extended hash that behaves as root of the <tt>Rails::Paths</tt> system.
Drop unnecessary require in Rails::Paths