diff --git a/libexec/irb b/libexec/irb
index ffc97867d0..c64ee85fbd 100755
--- a/libexec/irb
+++ b/libexec/irb
@@ -6,6 +6,6 @@
 #   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
 #
 
-require_relative '../lib/irb'
+require "irb"
 
 IRB.start(__FILE__)