diff --git a/volumes/conf.d/ha.zinomedia.de.conf b/volumes/conf.d/ha.zinomedia.de.conf
index 3efc32a..1465b59 100644
--- a/volumes/conf.d/ha.zinomedia.de.conf
+++ b/volumes/conf.d/ha.zinomedia.de.conf
@@ -1,3 +1,8 @@
+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    '' close;
+}
+
 server {
     listen 443 ssl;
     listen [::]:443 ssl;