diff --git a/docker/api/default.conf b/docker/api/default.conf
index 0500d7f..2be29bd 100644
--- a/docker/api/default.conf
+++ b/docker/api/default.conf
@@ -20,7 +20,7 @@ server {
 
     location /json {
         alias /api/api/static/templates/header.json;
-        add_header  Content-Type application/json;
+        default_type application/json;
         index header.json;
         expires max;
         log_not_found off;
@@ -29,7 +29,7 @@ server {
 
     location /header/html {
         alias /api/api/static/templates/header.html;
-        add_header  Content-Type text/html;
+        default_type text/html;
         index header.html;
         expires max;
         log_not_found off;
@@ -38,7 +38,7 @@ server {
 
     location /header/html/nextcloud {
         alias /api/api/static/templates/header_nextcloud.html;
-        add_header  Content-Type text/html;
+        default_type text/html;
         index header_nextcloud.html
         expires max;
         log_not_found off;