diff --git a/collabora.subdomain.conf.sample b/collabora.subdomain.conf.sample
index 91158e7..738a84e 100644
--- a/collabora.subdomain.conf.sample
+++ b/collabora.subdomain.conf.sample
@@ -32,7 +32,7 @@ server {
         resolver 127.0.0.11 valid=30s;
         set $upstream_app collabora;
         set $upstream_port 9980;
-        set $upstream_proto http;
+        set $upstream_proto https;
         proxy_pass $upstream_proto://$upstream_app:$upstream_port;
 
     }