diff --git a/roles/hedgedoc/templates/nginx.d.conf.j2 b/roles/hedgedoc/templates/nginx.d.conf.j2
index 293486c68f786038e830a74bf873c39e0083ee83..582a6e537501e285f2373e73018363d3b6f06574 100644
--- a/roles/hedgedoc/templates/nginx.d.conf.j2
+++ b/roles/hedgedoc/templates/nginx.d.conf.j2
@@ -2,6 +2,11 @@ upstream hedgedoc {
     server localhost:3000;
 }
 
+map $http_upgrade $connection_upgrade {
+        default upgrade;
+        ''      close;
+}
+
 server {
     listen       80;
     listen       [::]:80;
@@ -43,5 +48,7 @@ server {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
+       proxy_set_header Upgrade $http_upgrade;
+       proxy_set_header Connection $connection_upgrade;
    }
 }