diff --git a/infra/occupymedia/edge/nginx.conf b/infra/occupymedia/edge/nginx.conf
index c096e5c..699e407 100644
--- a/infra/occupymedia/edge/nginx.conf
+++ b/infra/occupymedia/edge/nginx.conf
@@ -248,6 +248,8 @@ http {
       proxy_pass http://192.168.13.210:9200;
       proxy_http_version 1.1;
       proxy_set_header Host $host;
+      # sub_filter cannot rewrite upstream-gzipped bodies; force plain HTML.
+      proxy_set_header Accept-Encoding "";
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       proxy_set_header X-Forwarded-Proto https;
       proxy_set_header Upgrade $http_upgrade;