diff --git a/scripts/fix-index-html-once.mjs b/scripts/fix-index-html-once.mjs
new file mode 100644
index 0000000..417c82f
--- /dev/null
+++ b/scripts/fix-index-html-once.mjs
@@ -0,0 +1,16 @@
+import fs from 'node:fs';
+const path='public/index.html';
+let html=fs.readFileSync(path,'utf8');
+const broken='}<style id="sun-composition-v1757">';
+const fixed='}</style><style id="sun-composition-v1757">';
+if(html.includes(fixed)){
+  console.log('index.html already fixed');
+  process.exit(0);
+}
+if(!html.includes(broken)){
+  console.error('Expected malformed style boundary not found');
+  process.exit(2);
+}
+html=html.replace(broken,fixed);
+fs.writeFileSync(path,html);
+console.log('Fixed missing </style> before sun-composition-v1757');