diff --git a/lib/apiswagger.js b/lib/apiswagger.js
index 315b571..84141ce 100644
--- a/lib/apiswagger.js
+++ b/lib/apiswagger.js
@@ -496,11 +496,11 @@ module.exports = (app, client) => {
     *       200:
     *         description: A file compressed with gzip.
     *         content:
-    *           application/octect-stream
+    *           application/gzip:
     */
     app.use('/api/download_index', async (req, res) => {
         try {
-            res.setHeader('Content-Type', 'application/x-gzip')
+            res.setHeader('Content-Type', 'application/gzip')
             res.setHeader('Content-disposition', 'attachment; filename=fediblock-index.json.gz')
             const result = await client.search({
                 index: constant.index,
diff --git a/public/main.js b/public/main.js
index be2928c..7143ddb 100644
--- a/public/main.js
+++ b/public/main.js
@@ -117,7 +117,7 @@ document.addEventListener('DOMContentLoaded', function () {
                 a = document.createElement('a')
             a.download = 'fediblock-index.json.gz'
             a.href = URL.createObjectURL(res)
-            a.type = 'application/x-gzip'
+            a.type = 'application/gzip'
             a.target = '_blank'
             a.dispatchEvent(new MouseEvent('click'))
             document.getElementById('loader-content').style.display = 'none'