diff --git a/klayout/pyproject.toml b/klayout/pyproject.toml
index a9605e01..ad7259fe 100644
--- a/klayout/pyproject.toml
+++ b/klayout/pyproject.toml
@@ -1,3 +1,8 @@
+[tool.setuptools]
+packages = [
+  "siepic_ebeam_pdk",
+]
+
 [project]
 name = "siepic_ebeam_pdk"
 version = "0.4.11"
@@ -18,7 +23,6 @@ dependencies = [
 ]
 
 
-
 [project.urls]
 Homepage = "https://github.com/SiEPIC/SiEPIC_EBeam_PDK"
 Issues = "https://github.com/SiEPIC/SiEPIC_EBeam_PDK/issues"