diff --git a/pyproject.toml b/pyproject.toml
index 5fc61aa..a3dcfd6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,5 +21,9 @@ optional = ["matplotlib"]
 style = ["pydocstyle", "flake8"]
 test = ["pytest", "pytest-xdist", "bempp-cl[optional]"]
 
-[tool.setuptools]
-packages = ["bempp_cl", "bempp_cl.api", "bempp_cl.core"]
+[build-system]
+requires = ["setuptools"]
+
+[tool.setuptools.packages.find]
+where = [""]
+include = ["bempp_cl"]