diff --git a/test/ruby/test_transcode.rb b/test/ruby/test_transcode.rb
index f0111243ce..d7a4aca99c 100644
--- a/test/ruby/test_transcode.rb
+++ b/test/ruby/test_transcode.rb
@@ -546,6 +546,7 @@ class TestTranscode < Test::Unit::TestCase
     check_both_ways("\u005C", "\x5C", "eucJP-ms")
     check_both_ways("\u005C", "\x5C", "CP51932")
     check_both_ways("\u005C", "\x5C", "ISO-2022-JP")
+    assert_equal("\u005C", "\e(B\x5C\e(B".encode("UTF-8", "ISO-2022-JP"))
     assert_equal("\u005C", "\e(J\x5C\e(B".encode("UTF-8", "ISO-2022-JP"))
     assert_raise(Encoding::ConversionUndefined) { "\u00A5".encode("Shift_JIS") }
     assert_raise(Encoding::ConversionUndefined) { "\u00A5".encode("Windows-31J") }
@@ -568,6 +569,7 @@ class TestTranscode < Test::Unit::TestCase
     check_both_ways("\u007E", "\x7E", "eucJP-ms")
     check_both_ways("\u007E", "\x7E", "CP51932")
     check_both_ways("\u007E", "\x7E", "ISO-2022-JP")
+    assert_equal("\u007E", "\e(B\x7E\e(B".encode("UTF-8", "ISO-2022-JP"))
     assert_equal("\u007E", "\e(J\x7E\e(B".encode("UTF-8", "ISO-2022-JP"))
     assert_raise(Encoding::ConversionUndefined) { "\u203E".encode("Shift_JIS") }
     assert_raise(Encoding::ConversionUndefined) { "\u203E".encode("Windows-31J") }