diff --git a/pyproject.toml b/pyproject.toml
index a5c9a0d..6f5ea1e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,7 @@ classifiers = [
 dynamic = ["dependencies", "optional-dependencies"]
 
 [tool.setuptools]
-py-modules = ["adafruit_wsgi"]
+packages = ["adafruit_wsgi"]
 
 [tool.setuptools.dynamic]
 dependencies = {file = ["requirements.txt"]}