diff --git a/puppet/zulip/files/nginx/zulip-include-frontend/app b/puppet/zulip/files/nginx/zulip-include-frontend/app
index c4f1ebc21b..bb99079647 100644
--- a/puppet/zulip/files/nginx/zulip-include-frontend/app
+++ b/puppet/zulip/files/nginx/zulip-include-frontend/app
@@ -48,6 +48,12 @@ location /help {
     index /index.html;
     try_files $uri $uri/index.html =404;
 
+    # These files are hashed and thus immutable; cache them aggressively.
+    # https://github.com/Pagefind/pagefind/issues/747#issuecomment-2510564644
+    location ~ ^/help/(pagefind/.*\.(?:pf_fragment|pf_index|pf_meta))$ {
+        add_header Cache-Control "public, max-age=31536000, immutable";
+    }
+
     # These files are hashed and thus immutable; cache them aggressively.
     # https://github.com/withastro/docs/blob/53603ad048e8aedbca1aed77bac8eb00dcada79d/src/content/docs/en/guides/integrations-guide/node.mdx?plain=1#L304
     location /help/_astro/ {