diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0ed9c5ac17e96..33f719fc12e0d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -42,6 +42,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Fix potential concurrent modification exception when updating allocation filters ([#19701])(https://github.com/opensearch-project/OpenSearch/pull/19701))
 - Fix file-based ingestion consumer to handle start point beyond max line number([#19757])(https://github.com/opensearch-project/OpenSearch/pull/19757))
 - Fixed assertion unsafe use of ClusterService.state() in ResourceUsageCollectorService ([#19775])(https://github.com/opensearch-project/OpenSearch/pull/19775))
+- Add S3Repository.LEGACY_MD5_CHECKSUM_CALCULATION to list of repository-s3 settings ([#19788](https://github.com/opensearch-project/OpenSearch/pull/19788))
 
 ### Dependencies
 - Update to Gradle 9.1 ([#19575](https://github.com/opensearch-project/OpenSearch/pull/19575))
diff --git a/plugins/repository-s3/src/main/java/org/opensearch/repositories/s3/S3RepositoryPlugin.java b/plugins/repository-s3/src/main/java/org/opensearch/repositories/s3/S3RepositoryPlugin.java
index 0f501eae27ad0..4b5510ad70186 100644
--- a/plugins/repository-s3/src/main/java/org/opensearch/repositories/s3/S3RepositoryPlugin.java
+++ b/plugins/repository-s3/src/main/java/org/opensearch/repositories/s3/S3RepositoryPlugin.java
@@ -367,6 +367,7 @@ public List<Setting<?>> getSettings() {
             S3ClientSettings.ROLE_ARN_SETTING,
             S3ClientSettings.IDENTITY_TOKEN_FILE_SETTING,
             S3ClientSettings.ROLE_SESSION_NAME_SETTING,
+            S3ClientSettings.LEGACY_MD5_CHECKSUM_CALCULATION,
             S3Repository.PARALLEL_MULTIPART_UPLOAD_MINIMUM_PART_SIZE_SETTING,
             S3Repository.PARALLEL_MULTIPART_UPLOAD_ENABLED_SETTING,
             S3Repository.REDIRECT_LARGE_S3_UPLOAD,