diff --git a/ChangeLog b/ChangeLog
index c110b68ca2..129bb4a2d6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu Feb  7 21:09:23 2013  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* test/rubygems/test_gem_config_file.rb
+	  (TestGemConfigFile#test_check_credentials_permissions): skip on
+	  Windows. see [Bug #7784] [ruby-core:51864] and r39070.
+
 Thu Feb  7 20:52:40 2013  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/Makefile.sub (config.status): added variables which were
diff --git a/test/rubygems/test_gem_config_file.rb b/test/rubygems/test_gem_config_file.rb
index 89e16d3a34..d17817332c 100644
--- a/test/rubygems/test_gem_config_file.rb
+++ b/test/rubygems/test_gem_config_file.rb
@@ -165,6 +165,8 @@ class TestGemConfigFile < Gem::TestCase
   end
 
   def test_check_credentials_permissions
+    skip 'chmod not supported' if win_platform?
+
     @cfg.rubygems_api_key = 'x'
 
     File.chmod 0644, @cfg.credentials_path