diff --git a/management/backup.py b/management/backup.py
index 311db3c3..b141c293 100755
--- a/management/backup.py
+++ b/management/backup.py
@@ -258,6 +258,8 @@ def get_duplicity_env_vars(env):
 	if get_target_type(config) == 's3':
 		env["AWS_ACCESS_KEY_ID"] = config["target_user"]
 		env["AWS_SECRET_ACCESS_KEY"] = config["target_pass"]
+		env["AWS_REQUEST_CHECKSUM_CALCULATION"] = "WHEN_REQUIRED"
+		env["AWS_RESPONSE_CHECKSUM_VALIDATION"] = "WHEN_REQUIRED"
 
 	return env