diff --git a/setup.py b/setup.py
index 30cab6e..c3038a1 100755
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@
         'Programming Language :: Python'
     ],
     options={'clean': {'all': 1}},
-    packages=['mockfs'],
+    packages=['mockfs', 'mockfs.tests'],
 )