diff --git a/test/ruby/test_marshal.rb b/test/ruby/test_marshal.rb
index 58831f3709..f7f273af42 100644
--- a/test/ruby/test_marshal.rb
+++ b/test/ruby/test_marshal.rb
@@ -814,6 +814,10 @@ class TestMarshal < Test::Unit::TestCase
     assert_raise(ArgumentError, /\(given 1, expected 0\)/) {
       ruby2_keywords_test(*[hash2])
     }
+    hash2 = Marshal.load(data.sub(/:\x06K(?=T\z)/, "I\\&\x06:\x0dencoding\"\x0aUTF-7"))
+    assert_raise(ArgumentError, /\(given 1, expected 0\)/) {
+      ruby2_keywords_test(*[hash2])
+    }
   end
 
   def test_invalid_byte_sequence_symbol