diff --git a/ChangeLog b/ChangeLog
index 6cbbe5348b..acadee538d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Jan 30 12:53:38 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* enc/emacs_mule.c (emacsmule_islead): fix inverse condition.
+
 Sun Jan 30 09:37:25 2011  Yutaka Kanemoto  <kanemoto@ruby-lang.org>
 
 	* io.c (struct argf): char behaves like an unsigned char
diff --git a/enc/emacs_mule.c b/enc/emacs_mule.c
index 246593b7eb..117c1aff39 100644
--- a/enc/emacs_mule.c
+++ b/enc/emacs_mule.c
@@ -30,7 +30,7 @@
 #include "regint.h"
 
 
-#define emacsmule_islead(c)    ((UChar )((c) - 0x81) > 0x9d - 0x81)
+#define emacsmule_islead(c)    ((UChar )((c) - 0x81) < 0x9e - 0x81)
 
 /*
     CHARACTER := ASCII_CHAR | MULTIBYTE_CHAR
diff --git a/test/ruby/test_m17n.rb b/test/ruby/test_m17n.rb
index b6dac01017..8a945481c3 100644
--- a/test/ruby/test_m17n.rb
+++ b/test/ruby/test_m17n.rb
@@ -1106,6 +1106,18 @@ class TestM17N < Test::Unit::TestCase
     s1 = s("\x81\x40")
     s2 = "@"
     assert_equal(false, s1.end_with?(s2), "#{encdump s1}.end_with?(#{encdump s2})")
+    s1orig = "\u3042\u3044"
+    s2orig = "\u3044"
+    Encoding.list.each do |enc|
+      next if enc.dummy?
+      begin
+        s1 = s1orig.encode(enc)
+        s2 = s2orig.encode(enc)
+      rescue
+      else
+        assert_equal(true, s1.end_with?(s2), "#{encdump s1}.end_with?(#{encdump s2})")
+      end
+    end
   end
 
   def test_each_line