diff --git a/test/ruby/test_m17n_comb.rb b/test/ruby/test_m17n_comb.rb
index c9317c08e2..b5208f44f1 100644
--- a/test/ruby/test_m17n_comb.rb
+++ b/test/ruby/test_m17n_comb.rb
@@ -322,7 +322,6 @@ class TestM17NComb < Test::Unit::TestCase
           (s1.ascii_only? && s2.ascii_only? or
            s1.encoding == s2.encoding) then
         assert(s1 == s2, desc_eq)
-        assert(s1.eql?(s2), desc_eq)
         assert(!(s1 != s2))
         assert_equal(0, s1 <=> s2)
         assert(s1.eql?(s2), desc_eq)