diff --git a/pyproject.toml b/pyproject.toml
index a3dcfd6..62136e5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,6 +24,22 @@ test = ["pytest", "pytest-xdist", "bempp-cl[optional]"]
 [build-system]
 requires = ["setuptools"]
 
-[tool.setuptools.packages.find]
-where = [""]
-include = ["bempp_cl"]
+[tool.setuptools]
+packages = [
+    "bempp_cl",
+    "bempp_cl.api",
+    "bempp_cl.api.assembly",
+    "bempp_cl.api.external",
+    "bempp_cl.api.fmm",
+    "bempp_cl.api.grid",
+    "bempp_cl.api.integration",
+    "bempp_cl.api.linalg",
+    "bempp_cl.api.operators",
+    "bempp_cl.api.operators.boundary",
+    "bempp_cl.api.operators.far_field",
+    "bempp_cl.api.operators.potential",
+    "bempp_cl.api.shapes",
+    "bempp_cl.api.space",
+    "bempp_cl.api.utils",
+    "bempp_cl.core"
+]