diff --git a/src/main.py b/src/main.py
index b650ab1..4e59523 100644
--- a/src/main.py
+++ b/src/main.py
@@ -594,6 +594,12 @@ def export(
                 conv_id = raw_conv.get("id") or raw_conv.get("uuid", "unknown")
                 try:
                     full_raw = prov_instance.get_conversation(conv_id)
+                    # Propagate provider annotations from the listing summary
+                    # (e.g. _project_name set by ChatGPT project fetching) into
+                    # the full detail so normalize_conversation can use them.
+                    for key, val in raw_conv.items():
+                        if key.startswith("_") and key not in full_raw:
+                            full_raw[key] = val
                     normalized = prov_instance.normalize_conversation(full_raw)
 
                     exported_path: Path | None = None
diff --git a/src/providers/chatgpt.py b/src/providers/chatgpt.py
index 1bf6fdb..f6e0f42 100644
--- a/src/providers/chatgpt.py
+++ b/src/providers/chatgpt.py
@@ -551,12 +551,16 @@ class ChatGPTProvider(BaseProvider):
         created_at = _ts_to_iso(raw.get("create_time"))
         updated_at = _ts_to_iso(raw.get("update_time"))
 
-        # Look up project name from the map built during fetch_all_conversations.
-        project = self._project_map.get(conv_id) if conv_id else None
+        # Prefer _project_name annotation injected from the listing summary
+        # (propagated by the export loop). Fall back to _project_map lookup.
+        project = raw.get("_project_name") or (
+            self._project_map.get(conv_id) if conv_id else None
+        )
         logger.debug(
-            "[chatgpt] normalize_conversation[%s]: project_map lookup → %r",
+            "[chatgpt] normalize_conversation[%s]: project=%r (source=%s)",
             conv_id[:8] if conv_id else "?",
             project,
+            "_project_name" if raw.get("_project_name") else "_project_map",
         )
 
         mapping: dict = raw.get("mapping", {})