diff --git a/Jenkinsfile.backend-docker b/Jenkinsfile.backend-docker
index 056757a..b7716c8 100644
--- a/Jenkinsfile.backend-docker
+++ b/Jenkinsfile.backend-docker
@@ -220,7 +220,7 @@ payload = {
   'contents': ['admin-web', 'MiaoJiZhang.Api'],
   'smokeTests': ['image architecture', '/api/ping', 'admin web index'],
 }
-path.write_text(json.dumps(payload, ensure_ascii=False, indent=2) + '\n', encoding='utf-8')
+path.write_text(json.dumps(payload, ensure_ascii=False, indent=2) + chr(10), encoding='utf-8')
 PY
                     sha256sum "$MANIFEST_PATH" >"$MANIFEST_PATH.sha256"
                 '''