diff -rup kombu-1.5.1-orig/kombu/serialization.py kombu-1.5.1/kombu/serialization.py
--- kombu-1.5.1-orig/kombu/serialization.py	2016-03-09 15:11:34.000000000 +0100
+++ kombu-1.5.1/kombu/serialization.py	2016-03-09 15:19:20.000000000 +0100
@@ -318,7 +318,7 @@ def register_msgpack():
     """See http://msgpack.sourceforge.net/"""
     try:
         import msgpack
-        registry.register('msgpack', msgpack.packs, msgpack.unpacks,
+        registry.register('msgpack', msgpack.packb, msgpack.unpackb,
                 content_type='application/x-msgpack',
                 content_encoding='binary')
     except ImportError: