diff --git a/volumes/conf.d/mail.zinomedia.de.conf b/volumes/conf.d/mail.zinomedia.de.conf
index 1d38096..9eb7501 100644
--- a/volumes/conf.d/mail.zinomedia.de.conf
+++ b/volumes/conf.d/mail.zinomedia.de.conf
@@ -1,6 +1,7 @@
 server {
-    listen 443 ssl http2;
-    listen [::]:443 ssl http2;
+    listen 443 ssl;
+    listen [::]:443 ssl;
+    http2 on;
     server_name mail.zinomedia.de autodiscover.* autoconfig.*;
 
     ssl_certificate /opt/mailcow-dockerized/data/assets/ssl/cert.pem;