diff --git a/parsedmarc/elastic.py b/parsedmarc/elastic.py
index 6193548..c823e07 100644
--- a/parsedmarc/elastic.py
+++ b/parsedmarc/elastic.py
@@ -735,6 +735,7 @@ def save_smtp_tls_report_to_elasticsearch(
         index_date = begin_date.strftime("%Y-%m")
     else:
         index_date = begin_date.strftime("%Y-%m-%d")
+    report = report.copy()
     report["begin_date"] = begin_date
     report["end_date"] = end_date
 
diff --git a/parsedmarc/opensearch.py b/parsedmarc/opensearch.py
index 5b46d6c..0e27141 100644
--- a/parsedmarc/opensearch.py
+++ b/parsedmarc/opensearch.py
@@ -764,6 +764,7 @@ def save_smtp_tls_report_to_opensearch(
         index_date = begin_date.strftime("%Y-%m")
     else:
         index_date = begin_date.strftime("%Y-%m-%d")
+    report = report.copy()
     report["begin_date"] = begin_date
     report["end_date"] = end_date