diff --git a/setup.py b/setup.py
index 24cd9d83..a829dd8a 100644
--- a/setup.py
+++ b/setup.py
@@ -64,7 +64,7 @@ setup(
     description='A microframework based on Werkzeug, Jinja2 '
                 'and good intentions',
     long_description=__doc__,
-    packages=['flask', 'flask.ext'],
+    packages=['flask', 'flask.ext', 'flask.json'],
     include_package_data=True,
     zip_safe=False,
     platforms='any',