diff --git a/dist/nginx.conf b/dist/nginx.conf
index a421e000060..e9f08b2d32c 100644
--- a/dist/nginx.conf
+++ b/dist/nginx.conf
@@ -66,6 +66,11 @@ server {
   gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/rss+xml text/javascript image/svg+xml image/x-icon;
   gzip_static on;
 
+  # Fix "upstream sent too big header while reading response header from upstream" and similar (Large headers).
+  proxy_buffer_size 16k;  # (default 8k)
+  proxy_buffers 8 16k;  # (default 8 8k)
+  proxy_busy_buffers_size 32k;  # (default 8k|16k)
+
   location / {
     add_header Strict-Transport-Security "max-age=63072000; includeSubDomains";
     try_files $uri @mastodon;