diff --git a/setup.py b/setup.py
index eb897f2..1cbc24e 100644
--- a/setup.py
+++ b/setup.py
@@ -32,6 +32,7 @@ setup(name='msgpack',
       version=version,
       cmdclass={'build_ext': build_ext},
       ext_modules=[msgpack_mod],
+      packages=['msgpack'],
       description=desc,
       long_description=long_desc,
       )