diff --git a/backend/pashub_fetcher/pashub_client.py b/backend/pashub_fetcher/pashub_client.py
index 556884fe..4435c278 100644
--- a/backend/pashub_fetcher/pashub_client.py
+++ b/backend/pashub_fetcher/pashub_client.py
@@ -116,6 +116,9 @@ class PashubClient:
         latest_files: Dict[CoreFiles, EvidenceFileData] = {}
 
         for core_type, group in grouped.items():
+            if core_type == CoreFiles.RETROFIT_DESIGN_DOC and len(group) > 1:
+                osm_candidates = [f for f in group if "-OSM-" in f.file_name]
+                group = osm_candidates if osm_candidates else group
             latest = max(group, key=lambda f: datetime.fromisoformat(f.created_utc))
             latest_files[core_type] = latest