3 files changed, 8 insertions, 8 deletions
diff --git a/src/cryptography/hazmat/primitives/twofactor/hotp.py b/src/cryptography/hazmat/primitives/twofactor/hotp.py
index f59f551c..8c0cec14 100644
--- a/src/cryptography/hazmat/primitives/twofactor/hotp.py
+++ b/src/cryptography/hazmat/primitives/twofactor/hotp.py
@@ -15,7 +15,7 @@ from cryptography.hazmat.backends.interfaces import HMACBackend
 from cryptography.hazmat.primitives import constant_time, hmac
 from cryptography.hazmat.primitives.hashes import SHA1, SHA256, SHA512
 from cryptography.hazmat.primitives.twofactor import InvalidToken
-from cryptography.hazmat.primitives.twofactor.utils import generate_uri
+from cryptography.hazmat.primitives.twofactor.utils import _generate_uri
 
 
 class HOTP(object):
@@ -61,7 +61,7 @@ class HOTP(object):
         p = hmac_value[offset:offset + 4]
         return struct.unpack(">I", p)[0] & 0x7fffffff
 
-    def get_provisioning_uri(self, account_name, counter, issuer=None):
-        return generate_uri(self, 'hotp', account_name, issuer, [
+    def get_provisioning_uri(self, account_name, counter, issuer):
+        return _generate_uri(self, 'hotp', account_name, issuer, [
             ('counter', int(counter)),
         ])
diff --git a/src/cryptography/hazmat/primitives/twofactor/totp.py b/src/cryptography/hazmat/primitives/twofactor/totp.py
index 9c8eddad..98493b6d 100644
--- a/src/cryptography/hazmat/primitives/twofactor/totp.py
+++ b/src/cryptography/hazmat/primitives/twofactor/totp.py
@@ -11,7 +11,7 @@ from cryptography.hazmat.backends.interfaces import HMACBackend
 from cryptography.hazmat.primitives import constant_time
 from cryptography.hazmat.primitives.twofactor import InvalidToken
 from cryptography.hazmat.primitives.twofactor.hotp import HOTP
-from cryptography.hazmat.primitives.twofactor.utils import generate_uri
+from cryptography.hazmat.primitives.twofactor.utils import _generate_uri
 
 
 class TOTP(object):
@@ -33,7 +33,7 @@ class TOTP(object):
         if not constant_time.bytes_eq(self.generate(time), totp):
             raise InvalidToken("Supplied TOTP value does not match.")
 
-    def get_provisioning_uri(self, account_name, issuer=None):
-        return generate_uri(self._hotp, 'totp', account_name, issuer, [
+    def get_provisioning_uri(self, account_name, issuer):
+        return _generate_uri(self._hotp, 'totp', account_name, issuer, [
             ('period', int(self._time_step)),
         ])
diff --git a/src/cryptography/hazmat/primitives/twofactor/utils.py b/src/cryptography/hazmat/primitives/twofactor/utils.py
index 89d38ff2..ae32058b 100644
--- a/src/cryptography/hazmat/primitives/twofactor/utils.py
+++ b/src/cryptography/hazmat/primitives/twofactor/utils.py
@@ -1,11 +1,11 @@
-from __future__ import unicode_literals
+from __future__ import absolute_import, division, print_function
 
 import base64
 
 from six.moves.urllib.parse import quote, urlencode
 
 
-def generate_uri(hotp, type_name, account_name, issuer, extra_parameters):
+def _generate_uri(hotp, type_name, account_name, issuer, extra_parameters):
     parameters = [
         ('digits', hotp._length),
         ('secret', base64.b32encode(hotp._key)),