diff --git a/ChangeLog b/ChangeLog
index 0e52985d09..c991e1b23c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Feb 23 17:57:06 2003  WATANABE Hirofumi  <eban@ruby-lang.org>
+
+	* lib/fileutils (fu_stream_blksize): wrong logial condition.
+	  (and -> or).
+
 Sat Feb 22 02:45:20 2003  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* eval.c (rb_thread_create): may called from place higher than
diff --git a/lib/fileutils.rb b/lib/fileutils.rb
index 775b2bb535..0997b94735 100644
--- a/lib/fileutils.rb
+++ b/lib/fileutils.rb
@@ -725,7 +725,7 @@ module FileUtils
     streams.each do |s|
       next unless s.respond_to?(:stat)
       size = s.stat.blksize
-      return size unless size.nil? and size.zero?
+      return size unless size.nil? or size.zero?
     end
     1024
   end