diff --git a/services/smart.py b/services/smart.py
index e1d58c8..4b250f0 100644
--- a/services/smart.py
+++ b/services/smart.py
@@ -78,7 +78,7 @@ def _parse_smart_json(device: str, data: dict) -> dict:
     # Identity — ATA vs SCSI field names
     result["model"] = data.get("model_name") or data.get("scsi_model_name")
     result["serial"] = data.get("serial_number")
-    result["firmware"] = data.get("firmware_version") or data.get("scsi_revision_level")
+    result["firmware"] = data.get("firmware_version") or data.get("scsi_revision")
     result["capacity_bytes"] = data.get("user_capacity", {}).get("bytes")
 
     # WWN — ATA uses structured wwn{}, SCSI uses logical_unit_id string