diff --git a/S3/Crypto.py b/S3/Crypto.py
index 72302ed7..ef9d1661 100644
--- a/S3/Crypto.py
+++ b/S3/Crypto.py
@@ -20,6 +20,8 @@
     # Python 2 support
     from base64 import encodestring
 
+from base64 import b64encode
+
 from . import Config
 from logging import debug
 from .BaseUtils import encode_to_s3, decode_from_s3, s3_quote, md5, unicode
@@ -346,3 +348,11 @@ def calculateChecksum(buffer, mfile, offset, chunk_size, send_chunk):
 
     return md5_hash.hexdigest()
 __all__.append("calculateChecksum")
+
+def sha256_hash_to_base64(sha256_hash):
+    # Extract digest from sha256 hash
+    sha256_hash_digest = sha256_hash.digest()
+    # Then convert it to base64
+    sha256_hash_digest_b64 = b64encode(sha256_hash_digest).decode()
+    return sha256_hash_digest_b64
+__all__.append("sha256_hash_to_base64")
diff --git a/S3/S3.py b/S3/S3.py
index d4cac8f9..1c2b42e0 100644
--- a/S3/S3.py
+++ b/S3/S3.py
@@ -47,7 +47,7 @@
 from .ConnMan import ConnMan
 from .Crypto import (sign_request_v2, sign_request_v4, checksum_sha256_file,
                      checksum_sha256_buffer, generate_content_md5,
-                     hash_file_md5, calculateChecksum, format_param_str)
+                     hash_file_md5, calculateChecksum, format_param_str, sha256_hash_to_base64)
 
 try:
     from ctypes import ArgumentError
@@ -1848,6 +1848,11 @@ def send_file(self, request, stream, labels, buffer = '', throttle = 0,
             sha256_hash = checksum_sha256_file(stream, offset, size_total)
         request.body = sha256_hash
 
+        # Provide the checksum with the request. This is important for buckets that have 
+        # Object Lock enabled.
+
+        headers['x-amz-checksum-sha256'] = sha256_hash_to_base64(sha256_hash)
+
         if use_expect_continue:
             if not size_total:
                 use_expect_continue = False