diff --git a/management/backup.py b/management/backup.py
index bbad0d3e..85bf6ba4 100755
--- a/management/backup.py
+++ b/management/backup.py
@@ -67,7 +67,7 @@ def backup_status(env):
 		"/usr/bin/duplicity",
 		"collection-status",
 		"--archive-dir", backup_cache_dir,
-		"--gpg-options", "--cipher-algo=AES256",
+		"--gpg-options", "'--cipher-algo=AES256'",
 		"--log-fd", "1",
 		get_duplicity_target_url(config),
 		] + get_duplicity_additional_args(env),
@@ -349,7 +349,7 @@ def perform_backup(full_backup):
 			"--archive-dir", backup_cache_dir,
 			"--exclude", backup_root,
 			"--volsize", "250",
-			"--gpg-options", "--cipher-algo=AES256",
+			"--gpg-options", "'--cipher-algo=AES256'",
 			env["STORAGE_ROOT"],
 			get_duplicity_target_url(config),
 			"--allow-source-mismatch"