diff --git a/flake8/api.py b/flake8/api/__init__.py
similarity index 100%
rename from flake8/api.py
rename to flake8/api/__init__.py
diff --git a/setup.py b/setup.py
index be77c07..6c3ccdc 100644
--- a/setup.py
+++ b/setup.py
@@ -68,6 +68,7 @@ setuptools.setup(
     url="https://gitlab.com/pycqa/flake8",
     packages=[
         "flake8",
+        "flake8.api",
         "flake8.formatting",
         "flake8.main",
         "flake8.options",