diff --git a/setup.py b/setup.py
index 3f5ed39be..69692198f 100644
--- a/setup.py
+++ b/setup.py
@@ -109,7 +109,13 @@ def main():
         python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*",
         install_requires=install_requires,
         extras_require=extras_require,
-        packages=["_pytest", "_pytest.assertion", "_pytest._code", "_pytest.mark"],
+        packages=[
+            "_pytest",
+            "_pytest.assertion",
+            "_pytest._code",
+            "_pytest.mark",
+            "_pytest.config",
+        ],
         py_modules=["pytest"],
         zip_safe=False,
     )
diff --git a/src/_pytest/config.py b/src/_pytest/config/__init__.py
similarity index 100%
rename from src/_pytest/config.py
rename to src/_pytest/config/__init__.py