diff --git a/{{cookiecutter.repo_name}}/pyproject.toml b/{{cookiecutter.repo_name}}/pyproject.toml
index 4ba72cec3792e3a2722ba46ccbc73b9e48bca4a5..88ba3d9074ef6dc0bcce78c07fee1dcd2d6f1152 100644
--- a/{{cookiecutter.repo_name}}/pyproject.toml
+++ b/{{cookiecutter.repo_name}}/pyproject.toml
@@ -23,6 +23,9 @@ dependencies = [
 ]
 dynamic = ["version"]
 
+[tool.setuptools]
+packages = ["{{cookiecutter.project_name}}"]
+
 [project.optional-dependencies]
 develop = [
     "pre-commit>=2.8.2",