diff --git a/ChangeLog b/ChangeLog
index c48b937bdf..48cc66b23c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-Sun Feb 13 09:56:40 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Sun Feb 13 09:56:44 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* test/openssl/test_config.rb (OpenSSL#test_freeze): fix error
+	 message assertion.
 
 	* test/io/nonblock/test_flush.rb (TestIONonblock#flush_test):
 	 return true to finish the test.
diff --git a/test/openssl/test_config.rb b/test/openssl/test_config.rb
index 1239e50b48..393cf1d94d 100644
--- a/test/openssl/test_config.rb
+++ b/test/openssl/test_config.rb
@@ -262,11 +262,12 @@ __EOC__
     c['foo'] = [['key', 'value']]
     c.freeze
 
-    # [ruby-core:18377]
+    bug = '[ruby-core:18377]'
     # RuntimeError for 1.9, TypeError for 1.8
-    assert_raise(TypeError, /frozen/) do
+    e = assert_raise(TypeError, bug) do
       c['foo'] = [['key', 'wrong']]
     end
+    assert_match(/can't modify/, e.message, bug)
   end
 
   def test_dup