diff --git a/lib/readline.rb b/lib/readline.rb
index 6cc923cb2f..29cdf3a14f 100644
--- a/lib/readline.rb
+++ b/lib/readline.rb
@@ -2,5 +2,6 @@ begin
   require 'readline.so'
 rescue LoadError
   require 'reline' unless defined? Reline
+  Object.send(:remove_const, :Readline) if Object.const_defined?(:Readline)
   Readline = Reline
 end