diff --git a/ChangeLog b/ChangeLog
index abc1f744f9..0865985a88 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Apr 10 21:26:22 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* lib/rdoc/markup/preprocess.rb (RDoc::Markup::PreProcess#handle):
+	  use File.binread to avoid locale dependency.
+
 Sat Apr 10 15:18:26 2010  Eric Hodel  <drbrain@segment7.net>
 
 	* lib/rdoc: Import RDoc 2.5.2
diff --git a/lib/rdoc/markup/preprocess.rb b/lib/rdoc/markup/preprocess.rb
index 7aac9df74a..b48f099119 100644
--- a/lib/rdoc/markup/preprocess.rb
+++ b/lib/rdoc/markup/preprocess.rb
@@ -46,7 +46,7 @@ class RDoc::Markup::PreProcess
 
   def include_file(name, indent)
     if full_name = find_include_file(name) then
-      content = File.read full_name
+      content = File.binread full_name
       content = content.sub(/\A# .*coding[=:].*$/, '').lstrip
 
       # strip leading '#'s, but only if all lines start with them