diff --git a/ChangeLog b/ChangeLog
index 94fcf8ad6d..da43fbfdef 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+Sun Mar 10 23:27:54 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/rubygems/ext/ext_conf_builder.rb (Gem::Ext::ExtConfBuilder.build):
+	  it is impossible to predict which file will be installed to where,
+	  by the arguments, so use intermediate destination directory always.
+	  [Bug #7698]
+
+Sun Mar 10 23:27:05 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/rubygems/ext/ext_conf_builder.rb (Gem::Ext::ExtConfBuilder.build):
+	  it is impossible to predict which file will be installed to where,
+	  by the arguments, so use intermediate destination directory always.
+	  [Bug #7698]
+
 Sun Mar 10 17:00:22 2013  Tadayoshi Funaba  <tadf@dotrb.org>
 
 	* complex.c: edited rdoc.
diff --git a/lib/rubygems/ext/ext_conf_builder.rb b/lib/rubygems/ext/ext_conf_builder.rb
index 39d772326a..a172afa7db 100644
--- a/lib/rubygems/ext/ext_conf_builder.rb
+++ b/lib/rubygems/ext/ext_conf_builder.rb
@@ -13,7 +13,7 @@ class Gem::Ext::ExtConfBuilder < Gem::Ext::Builder
   FileEntry = FileUtils::Entry_ # :nodoc:
 
   def self.build(extension, directory, dest_path, results, args=[])
-    tmp_dest = Dir.mktmpdir(".gem.", ".") if File.identical?(dest_path, ".")
+    tmp_dest = Dir.mktmpdir(".gem.", ".")
 
     Tempfile.open %w"siteconf .rb", "." do |siteconf|
       siteconf.puts "require 'rbconfig'"