diff --git a/mypy/py.typed b/mypy/py.typed
new file mode 100644
index 0000000000000..9724ed562890a
--- /dev/null
+++ b/mypy/py.typed
@@ -0,0 +1 @@
+# Marker file for PEP 561.  The mypy package uses inline types.
diff --git a/setup.py b/setup.py
index 30d1ea656e28a..b4ab6d60a1adf 100644
--- a/setup.py
+++ b/setup.py
@@ -99,6 +99,7 @@ def run(self):
       license='MIT License',
       py_modules=[],
       packages=['mypy', 'mypy.test', 'mypy.server', 'mypy.plugins'],
+      package_data={'mypy': ['py.typed']},
       entry_points={'console_scripts': ['mypy=mypy.__main__:console_entry',
                                         'stubgen=mypy.stubgen:main',
                                         'dmypy=mypy.dmypy:main',