diff --git a/ckanext/rating/__init__.py b/ckanext/rating/__init__.py
index e69de29..2e2033b 100644
--- a/ckanext/rating/__init__.py
+++ b/ckanext/rating/__init__.py
@@ -0,0 +1,7 @@
+# this is a namespace package
+try:
+    import pkg_resources
+    pkg_resources.declare_namespace(__name__)
+except ImportError:
+    import pkgutil
+    __path__ = pkgutil.extend_path(__path__, __name__)
diff --git a/setup.py b/setup.py
index 83b2335..6cd1c68 100644
--- a/setup.py
+++ b/setup.py
@@ -55,6 +55,8 @@ setup(
     # simple. Or you can use find_packages().
     packages=find_packages(exclude=['contrib', 'docs', 'tests*']),
 
+    namespace_packages=['ckanext', 'ckanext.rating'],
+
     # List run-time dependencies here.  These will be installed by pip when your
     # project is installed. For an analysis of "install_requires" vs pip's
     # requirements files see: