diff --git a/nginx.conf b/nginx.conf
index e5c9e7b..0d02224 100644
--- a/nginx.conf
+++ b/nginx.conf
@@ -35,7 +35,7 @@ http {
 	# Headers        #
 	##################
 
-	more_set_header 'X-Web-Entry Bifrost';
+	more_set_headers 'X-Web-Entry Bifrost';
 
 	##################
 	# SSL settings   #
diff --git a/sites-available/000-default.conf b/sites-available/000-default.conf
index 546f24c..7e5f634 100644
--- a/sites-available/000-default.conf
+++ b/sites-available/000-default.conf
@@ -10,8 +10,8 @@ server {
 
   server_name _;
 
-  more_set_header 'X-Dead-End true';
-  more_set_header 'Content-Type text/plain';
+  more_set_headers 'X-Dead-End true';
+  more_set_headers 'Content-Type text/plain';
 
   return 200 ok;
 }
@@ -24,8 +24,8 @@ server {
 
   server_name _;
 
-  more_set_header 'X-Dead-End true';
-  more_set_header 'Content-Type text/plain';
+  more_set_headers 'X-Dead-End true';
+  more_set_headers 'Content-Type text/plain';
 
   return 425 "SSL not supported here.";
 
diff --git a/sites-available/planetposen.conf b/sites-available/planetposen.conf
index f0410d5..2476289 100644
--- a/sites-available/planetposen.conf
+++ b/sites-available/planetposen.conf
@@ -24,7 +24,7 @@ server {
 
   server_name planetposen.no planet.schleppe.cloud;
 
-  more_set_header Upgrading Connection;
+  more_set_headers Upgrading Connection;
   return 302 https://$host$request_uri;
 }
 
@@ -66,9 +66,9 @@ server {
 
       proxy_request_buffering off;
 
-      more_set_header 'Access-Control-Allow-Origin planet.schleppe.cloud';
-      more_set_header 'Access-Control-Allow-Methods GET, POST, OPTIONS';
-      more_set_header 'Access-Control-Allow-Headers Content-Type';
+      more_set_headers 'Access-Control-Allow-Origin planet.schleppe.cloud';
+      more_set_headers 'Access-Control-Allow-Methods GET, POST, OPTIONS';
+      more_set_headers 'Access-Control-Allow-Headers Content-Type';
 
       client_max_body_size 5M;
     }
@@ -78,18 +78,18 @@ server {
       proxy_pass http://planetposen-backend/api;
 
 #      add_header 'Access-Control-Allow-Origin' 'planet.schleppe.cloud';
-      more_set_header 'Access-Control-Allow-Origin *';
-      more_set_header 'Access-Control-Allow-Methods GET, POST, OPTIONS';
-      more_set_header 'Access-Control-Allow-Headers Content-Type';
+      more_set_headers 'Access-Control-Allow-Origin *';
+      more_set_headers 'Access-Control-Allow-Methods GET, POST, OPTIONS';
+      more_set_headers 'Access-Control-Allow-Headers Content-Type';
     }
 
     location / {
       resolver 10.0.0.72;
       proxy_pass http://planetposen-frontend;
 
-      more_set_header 'Access-Control-Allow-Origin planet.schleppe.cloud';
-      more_set_header 'Access-Control-Allow-Methods GET, POST, OPTIONS';
-      more_set_header 'Access-Control-Allow-Headers Content-Type';
+      more_set_headers 'Access-Control-Allow-Origin planet.schleppe.cloud';
+      more_set_headers 'Access-Control-Allow-Methods GET, POST, OPTIONS';
+      more_set_headers 'Access-Control-Allow-Headers Content-Type';
     }
 
     ssl_certificate /etc/letsencrypt/live/planet.schleppe.cloud/fullchain.pem; # managed by Certbot
diff --git a/snippets/proxy-params.conf b/snippets/proxy-params.conf
index 19ddff1..c9a4ab4 100644
--- a/snippets/proxy-params.conf
+++ b/snippets/proxy-params.conf
@@ -3,4 +3,4 @@ proxy_set_header X-Real-IP $remote_addr;
 proxy_set_header X-Forwarded-for $proxy_add_x_forwarded_for;
 proxy_set_header Host $host;
 
-more_set_header 'X-Proxy-Params Applied';
+more_set_headers 'X-Proxy-Params Applied';