diff --git a/tutorial/rb/RubyClient.rb b/tutorial/rb/RubyClient.rb
index 8971fed..fd72699 100755
--- a/tutorial/rb/RubyClient.rb
+++ b/tutorial/rb/RubyClient.rb
@@ -24,7 +24,7 @@
 
 require 'thrift'
 
-require 'Calculator'
+require 'calculator'
 
 begin
   port = ARGV[0] || 9090