diff --git a/test/ruby/test_m17n.rb b/test/ruby/test_m17n.rb
index 52eb586d01..0ad7da9a60 100644
--- a/test/ruby/test_m17n.rb
+++ b/test/ruby/test_m17n.rb
@@ -826,7 +826,7 @@ class TestM17N < Test::Unit::TestCase
   end
 
   def test_end_with
-    assert_false("\x81\x40".force_encoding("sjis").end_with?("@"))
+    assert_equal(false, "\x81\x40".force_encoding("sjis").end_with?("@"))
   end
 
   def test_regexp_match