diff --git a/ds-caselaw-ingester/lambda_function.py b/ds-caselaw-ingester/lambda_function.py
index 7c9cf9c..1ff02ef 100644
--- a/ds-caselaw-ingester/lambda_function.py
+++ b/ds-caselaw-ingester/lambda_function.py
@@ -456,7 +456,7 @@ def set_document_identifiers(self) -> None:
 
         if ncn:
             doc.identifiers.add(NeutralCitationNumber(ncn))
-            doc.save_identifiers(doc)
+            doc.save_identifiers()
             logger.info(f"Ingested document had NCN {ncn}")
         else:
             logger.info(f"Ingested document had NCN (NOT FOUND)")