diff --git a/lib/irb/input-method.rb b/lib/irb/input-method.rb
index fd68239ee..a8227caa9 100644
--- a/lib/irb/input-method.rb
+++ b/lib/irb/input-method.rb
@@ -14,7 +14,6 @@
 require_relative 'completion'
 require 'io/console'
 require 'reline'
-require 'rdoc'
 
 module IRB
   STDIN_FILE_NAME = "(line)" # :nodoc: