diff --git a/runbot/templates/nginx.xml b/runbot/templates/nginx.xml
index 1512973e..daa4e8c0 100644
--- a/runbot/templates/nginx.xml
+++ b/runbot/templates/nginx.xml
@@ -7,6 +7,7 @@ error_log <t t-esc="nginx_dir"/>/error.log;
 worker_processes  1;
 events { worker_connections  1024; }
 http {
+charset utf-8;
 include /etc/nginx/mime.types;
 server_names_hash_max_size 512;
 server_names_hash_bucket_size 256;
@@ -25,6 +26,8 @@ autoindex on;
 gzip on;
 gzip_types text/css text/plain application/xml application/json application/javascript;
 
+charset_types text/plain;
+
 map $http_x_forwarded_proto $real_scheme {
   default $http_x_forwarded_proto;
   ''      $scheme;