diff --git a/atomic_reactor/plugins/cachi2_init.py b/atomic_reactor/plugins/cachi2_init.py
index 8698f798c..8a6622860 100644
--- a/atomic_reactor/plugins/cachi2_init.py
+++ b/atomic_reactor/plugins/cachi2_init.py
@@ -114,7 +114,7 @@ def process_remote_sources(self) -> List[Dict[str, Any]]:
             source_path_dep.mkdir()
 
             processed_remote_sources.append({
-                "source_path": source_path,
+                "source_path": str(source_path),
                 **remote_source,
             })