diff --git a/atomic_reactor/plugins/cachi2_postprocess.py b/atomic_reactor/plugins/cachi2_postprocess.py
index 73d706e49..b1ff8c32f 100644
--- a/atomic_reactor/plugins/cachi2_postprocess.py
+++ b/atomic_reactor/plugins/cachi2_postprocess.py
@@ -131,7 +131,7 @@ def postprocess_remote_sources(self) -> List[Cachi2RemoteSource]:
 
             remote_source_obj = Cachi2RemoteSource(
                 name=remote_source['name'] or '',
-                tarball_path=os.path.join(remote_source['source_path'], 'remote-source.tar.gz'),
+                tarball_path=Path(remote_source['source_path'], 'remote-source.tar.gz'),
                 sources_path=Path(remote_source['source_path']),
                 json_data=generate_request_json(remote_source['remote_source'], sbom_data, json_env_data),
                 json_env_data=json_env_data,