diff --git a/pysstv/sstv.py b/pysstv/sstv.py
index 9a491b0..4e552db 100644
--- a/pysstv/sstv.py
+++ b/pysstv/sstv.py
@@ -62,7 +62,7 @@ class SSTV(object):
         highest = amp - 1
         alias_cycle = cycle((alias * (random() - 0.5) for _ in xrange(1024)))
         for value, alias_item in izip(self.gen_values(), alias_cycle):
-            sample = int(round(value * amp + alias_item))
+            sample = int(value * amp + alias_item)
             yield (lowest if sample <= lowest else
                 sample if sample <= highest else highest)
 
diff --git a/pysstv/tests/test_sstv.py b/pysstv/tests/test_sstv.py
index 805e043..022f135 100644
--- a/pysstv/tests/test_sstv.py
+++ b/pysstv/tests/test_sstv.py
@@ -69,7 +69,7 @@ class TestSSTV(unittest.TestCase):
         mock_open = MagicMock(return_value=sio)
         with mock.patch('__builtin__.open', mock_open):
             self.s.write_wav('unittest.wav')
-        expected = 'bf61c82e96aed1370d5c1753d87729db'
+        expected = '8aa1d52b222b411e032ce2bce77d203a'
         data = sio.getvalue()
         actual = hashlib.md5(data).hexdigest()
         self.assertEqual(expected, actual)