diff --git a/ChangeLog b/ChangeLog
index 1193f82c74..46bf255b00 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun May  4 21:09:32 2008  Tanaka Akira  <akr@fsij.org>
+
+	* lib/getoptlong.rb: use $stderr instead of $deferr.
+
 Sun May  4 16:04:28 2008  Tanaka Akira  <akr@fsij.org>
 
 	* time.c (obj2nsec): fix string argument.
diff --git a/lib/getoptlong.rb b/lib/getoptlong.rb
index 3ebbf3b1b6..4cfb5fbd27 100644
--- a/lib/getoptlong.rb
+++ b/lib/getoptlong.rb
@@ -151,7 +151,7 @@ class GetoptLong
     @argument_flags = Hash.new
 
     #
-    # Whether error messages are output to $deferr.
+    # Whether error messages are output to $stderr.
     #
     @quiet = FALSE
 
@@ -380,7 +380,7 @@ class GetoptLong
   # Set an error (a protected method).
   #
   def set_error(type, message)
-    $deferr.print("#{$0}: #{message}\n") if !@quiet
+    $stderr.print("#{$0}: #{message}\n") if !@quiet
 
     @error = type
     @error_message = message