diff --git a/src/cryptography/x509.py b/src/cryptography/x509.py
index 0227765..50fae71 100644
--- a/src/cryptography/x509.py
+++ b/src/cryptography/x509.py
@@ -546,7 +546,7 @@
 
     def __repr__(self):
         return (
-            "<NoticeReference(organization={0.organization}, notice_numbers="
+            "<NoticeReference(organization={0.organization!r}, notice_numbers="
             "{0.notice_numbers})>".format(self)
         )
 
diff --git a/tests/test_x509_ext.py b/tests/test_x509_ext.py
index fa025d9..ae69f5f 100644
--- a/tests/test_x509_ext.py
+++ b/tests/test_x509_ext.py
@@ -50,11 +50,18 @@
         assert nr.notice_numbers is None
 
     def test_repr(self):
-        nr = x509.NoticeReference("org", [1, 3, 4])
+        nr = x509.NoticeReference(u"org", [1, 3, 4])
 
-        assert repr(nr) == (
-            "<NoticeReference(organization=org, notice_numbers=[1, 3, 4])>"
-        )
+        if six.PY3:
+            assert repr(nr) == (
+                "<NoticeReference(organization='org', notice_numbers=[1, 3, 4"
+                "])>"
+            )
+        else:
+            assert repr(nr) == (
+                "<NoticeReference(organization=u'org', notice_numbers=[1, 3, "
+                "4])>"
+            )
 
 
 class TestUserNotice(object):
@@ -68,11 +75,17 @@
         assert un.explicit_text == "text"
 
     def test_repr(self):
-        un = x509.UserNotice(x509.NoticeReference("org", None), "text")
-        assert repr(un) == (
-            "<UserNotice(notice_reference=<NoticeReference(organization=org, "
-            "notice_numbers=None)>, explicit_text='text')>"
-        )
+        un = x509.UserNotice(x509.NoticeReference(u"org", None), u"text")
+        if six.PY3:
+            assert repr(un) == (
+                "<UserNotice(notice_reference=<NoticeReference(organization='"
+                "org', notice_numbers=None)>, explicit_text='text')>"
+            )
+        else:
+            assert repr(un) == (
+                "<UserNotice(notice_reference=<NoticeReference(organization=u"
+                "'org', notice_numbers=None)>, explicit_text=u'text')>"
+            )
 
 
 class TestPolicyInformation(object):
@@ -96,7 +109,7 @@
             x509.PolicyInformation(x509.ObjectIdentifier("1.2.3"), [1, 2])
 
     def test_repr(self):
-        pq = [u"string", x509.UserNotice(None, "hi")]
+        pq = [u"string", x509.UserNotice(None, u"hi")]
         pi = x509.PolicyInformation(x509.ObjectIdentifier("1.2.3"), pq)
         if six.PY3:
             assert repr(pi) == (
@@ -108,7 +121,7 @@
             assert repr(pi) == (
                 "<PolicyInformation(policy_identifier=<ObjectIdentifier(oid=1."
                 "2.3, name=Unknown OID)>, policy_qualifiers=[u'string', <UserN"
-                "otice(notice_reference=None, explicit_text='hi')>])>"
+                "otice(notice_reference=None, explicit_text=u'hi')>])>"
             )