diff --git a/lib/irb/input-method.rb b/lib/irb/input-method.rb
index ea3f31bff..c91a99b56 100644
--- a/lib/irb/input-method.rb
+++ b/lib/irb/input-method.rb
@@ -319,11 +319,6 @@ def auto_indent(&block)
         [Reline::Key.new(nil, 0xE4, true)], # Normal Alt+d.
         [195, 164] # The "ä" that appears when Alt+d is pressed on xterm.
       ]
-      begin
-        require 'rdoc'
-      rescue LoadError
-        return nil
-      end
 
       if just_cursor_moving and completion_journey_data.nil?
         return nil