diff --git a/ChangeLog b/ChangeLog
index 13cecb8522..88ea8bb22c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue May 27 17:10:14 2014  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
+
+	* test/runner.rb: fixed randomly test failure.
+	  [Bug #6573][ruby-core:45563]
+
 Tue May 27 16:58:12 2014  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
 
 	* test/test_timeout.rb (test_timeout): inverted test condition.
diff --git a/test/runner.rb b/test/runner.rb
index 9c17743436..2956b85df8 100644
--- a/test/runner.rb
+++ b/test/runner.rb
@@ -5,6 +5,7 @@ $LOAD_PATH << src_testdir
 $LOAD_PATH.unshift "#{src_testdir}/lib"
 
 require 'test/unit'
+require_relative 'ruby/envutil'
 
 module Gem
 end