diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..0e9ec57
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,4 @@
+include convert.go
+include go.mod
+include go.sum
+
diff --git a/pyproject.toml b/pyproject.toml
index 77512b1..18f85aa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,6 +18,3 @@ classifiers = [
 
 [tool.setuptools]
 packages = ["go_org_py"]
-
-[tool.setuptools.package-data]
-"" = ["convert.go", "go.mod", "go.sum", "*.so"]