diff --git a/ChangeLog b/ChangeLog
index 95a106da21..b5c841bdfa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Sep 11 02:14:21 2009  Tanaka Akira  <akr@fsij.org>
+
+	* test/dl: use require_relative to require test_base.rb.
+
 Fri Sep 11 02:06:44 2009  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* parse.y (rb_char_to_option_kcode): ASCII-8BIT should
diff --git a/test/dl/test_cfunc.rb b/test/dl/test_cfunc.rb
index 9047c66b3c..3e928257bd 100644
--- a/test/dl/test_cfunc.rb
+++ b/test/dl/test_cfunc.rb
@@ -1,4 +1,4 @@
-require 'test_base'
+require_relative 'test_base'
 require 'dl/func'
 
 module DL
diff --git a/test/dl/test_cptr.rb b/test/dl/test_cptr.rb
index 07ad05ba25..55a53f97da 100644
--- a/test/dl/test_cptr.rb
+++ b/test/dl/test_cptr.rb
@@ -1,4 +1,4 @@
-require 'test_base'
+require_relative 'test_base'
 require_relative '../ruby/envutil'
 
 module DL
diff --git a/test/dl/test_dl2.rb b/test/dl/test_dl2.rb
index e52adbc83e..5a9daba42a 100644
--- a/test/dl/test_dl2.rb
+++ b/test/dl/test_dl2.rb
@@ -1,4 +1,4 @@
-require 'test_base.rb'
+require_relative 'test_base.rb'
 require 'dl/callback'
 
 module DL
diff --git a/test/dl/test_func.rb b/test/dl/test_func.rb
index be937719df..512c22851e 100644
--- a/test/dl/test_func.rb
+++ b/test/dl/test_func.rb
@@ -1,4 +1,4 @@
-require 'test_base'
+require_relative 'test_base'
 require 'dl/func'
 
 module DL
diff --git a/test/dl/test_import.rb b/test/dl/test_import.rb
index c70cb9a6d0..e4af382abc 100644
--- a/test/dl/test_import.rb
+++ b/test/dl/test_import.rb
@@ -1,4 +1,4 @@
-require 'test_base'
+require_relative 'test_base'
 require 'dl/import'
 
 module DL
diff --git a/test/dl/test_win32.rb b/test/dl/test_win32.rb
index 32beb2703f..d0c4571bf8 100644
--- a/test/dl/test_win32.rb
+++ b/test/dl/test_win32.rb
@@ -1,4 +1,4 @@
-require 'test_base'
+require_relative 'test_base'
 require 'dl/import'
 require 'dl/types'