--- pymsn-0.3.3-old/pymsn/msnp2p/transport/TLP.py	2008-05-22 00:42:31.000000000 +0200
+++ pymsn-0.3.3-new/pymsn/msnp2p/transport/TLP.py	2009-06-15 10:40:10.352325986 +0200
@@ -102,6 +102,7 @@
     ERR = 0x80
     KEY = 0x100
     CRYPT = 0x200
+    UNKNOWN = 0x1000000
 
 
 class MessageChunk(object):
@@ -114,7 +115,7 @@
         return str(self.header) + str(self.body)
 
     def is_control_chunk(self):
-        return self.header.flags & 0xFFFFFFCF
+        return self.header.flags & 0xCF
 
     def is_ack_chunk(self):
         return self.header.flags & (TLPFlag.NAK | TLPFlag.ACK)