diff --git a/lib/uplot.rb b/lib/uplot.rb
index c4146ca..178b885 100644
--- a/lib/uplot.rb
+++ b/lib/uplot.rb
@@ -1,7 +1,7 @@
 require 'unicode_plot'
 require 'uplot/version'
-require 'uplot/Preprocessing'
-require 'uplot/command.rb'
+require 'uplot/preprocessing'
+require 'uplot/command'
 
 module Uplot
 end