diff --git a/Lib/test/test_codecs.py b/Lib/test/test_codecs.py
index 9ca7699..4ec7b58 100644
--- a/Lib/test/test_codecs.py
+++ b/Lib/test/test_codecs.py
@@ -1521,32 +1521,32 @@
         self.assertEquals(codecs.raw_unicode_escape_decode(r"\u1234"), ("\u1234", 6))
         self.assertEquals(codecs.raw_unicode_escape_decode(br"\u1234"), ("\u1234", 6))
 
-class Utf8bTest(unittest.TestCase):
+class SurrogateEscapeTest(unittest.TestCase):
 
     def test_utf8(self):
         # Bad byte
-        self.assertEqual(b"foo\x80bar".decode("utf-8", "utf8b"),
+        self.assertEqual(b"foo\x80bar".decode("utf-8", "surrogateescape"),
                          "foo\udc80bar")
-        self.assertEqual("foo\udc80bar".encode("utf-8", "utf8b"),
+        self.assertEqual("foo\udc80bar".encode("utf-8", "surrogateescape"),
                          b"foo\x80bar")
         # bad-utf-8 encoded surrogate
-        self.assertEqual(b"\xed\xb0\x80".decode("utf-8", "utf8b"),
+        self.assertEqual(b"\xed\xb0\x80".decode("utf-8", "surrogateescape"),
                          "\udced\udcb0\udc80")
-        self.assertEqual("\udced\udcb0\udc80".encode("utf-8", "utf8b"),
+        self.assertEqual("\udced\udcb0\udc80".encode("utf-8", "surrogateescape"),
                          b"\xed\xb0\x80")
 
     def test_ascii(self):
         # bad byte
-        self.assertEqual(b"foo\x80bar".decode("ascii", "utf8b"),
+        self.assertEqual(b"foo\x80bar".decode("ascii", "surrogateescape"),
                          "foo\udc80bar")
-        self.assertEqual("foo\udc80bar".encode("ascii", "utf8b"),
+        self.assertEqual("foo\udc80bar".encode("ascii", "surrogateescape"),
                          b"foo\x80bar")
 
     def test_charmap(self):
         # bad byte: \xa5 is unmapped in iso-8859-3
-        self.assertEqual(b"foo\xa5bar".decode("iso-8859-3", "utf8b"),
+        self.assertEqual(b"foo\xa5bar".decode("iso-8859-3", "surrogateescape"),
                          "foo\udca5bar")
-        self.assertEqual("foo\udca5bar".encode("iso-8859-3", "utf8b"),
+        self.assertEqual("foo\udca5bar".encode("iso-8859-3", "surrogateescape"),
                          b"foo\xa5bar")
 
 
@@ -1576,7 +1576,7 @@
         CharmapTest,
         WithStmtTest,
         TypesTest,
-        Utf8bTest,
+        SurrogateEscapeTest,
     )
 
 
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index 014d874..c680d8d 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -708,13 +708,13 @@
             self.fsencoding = sys.getfilesystemencoding()
             sys.setfilesystemencoding("utf-8")
             self.dir = support.TESTFN
-            self.bdir = self.dir.encode("utf-8", "utf8b")
+            self.bdir = self.dir.encode("utf-8", "surrogateescape")
             os.mkdir(self.dir)
             self.unicodefn = []
             for fn in self.filenames:
                 f = open(os.path.join(self.bdir, fn), "w")
                 f.close()
-                self.unicodefn.append(fn.decode("utf-8", "utf8b"))
+                self.unicodefn.append(fn.decode("utf-8", "surrogateescape"))
 
         def tearDown(self):
             shutil.rmtree(self.dir)