diff --git a/pyproject.toml b/pyproject.toml
index 3114b4e..098c152 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,6 +29,10 @@ dependencies = [
 raman = "pynxtools_raman.reader:RamanReader"
 raman_multi = "pynxtools_raman_multiformat.reader:RamanReaderMulti"
 
+[tool.setuptools.packages.find]
+where = [
+    "src",
+]
 
 [project.urls]
 "Homepage" = "https://github.com/FAIRmat-NFDI/pynxtools-raman"