diff --git a/kombu/tests/transport/test_pyamqp.py b/kombu/tests/transport/test_pyamqp.py
index 69af0c87..181cfcf4 100644
--- a/kombu/tests/transport/test_pyamqp.py
+++ b/kombu/tests/transport/test_pyamqp.py
@@ -44,7 +44,7 @@ class test_Channel(TestCase):
                 pass
 
         self.conn = Mock()
-        self.conn._get_free_channel_id.side_effect = partial(next, count(0))
+        self.conn._get_free_channel_id.side_effect = count(0).next
         self.conn.channels = {}
         self.channel = Channel(self.conn, 0)
 
diff --git a/kombu/utils/__init__.py b/kombu/utils/__init__.py
index 7c4acbe7..5ab709fd 100644
--- a/kombu/utils/__init__.py
+++ b/kombu/utils/__init__.py
@@ -224,7 +224,7 @@ def retry_over_time(fun, catch, args=[], kwargs={}, errback=None,
             if callback:
                 callback()
             tts = (errback(exc, interval_range, retries) if errback
-                   else next(interval_range))
+                   else interval_range.next())
             if tts:
                 for i in range(int(tts / interval_step)):
                     if callback: