diff --git a/tests/test_transport.py b/tests/test_transport.py
index e102fe0..60ac1e7 100644
--- a/tests/test_transport.py
+++ b/tests/test_transport.py
@@ -603,6 +603,7 @@ class TransportTest (unittest.TestCase):
         bytes2 = self.tc.packetizer._Packetizer__sent_bytes
         # tests show this is actually compressed to *52 bytes*!  including packet overhead!  nice!! :)
         self.assert_(bytes2 - bytes < 1024)
+        self.assertEquals(52, bytes2 - bytes)
 
         chan.close()
         schan.close()