diff --git a/nginx/mattermost.conf b/nginx/mattermost.conf
index b7905dd..449104b 100644
--- a/nginx/mattermost.conf
+++ b/nginx/mattermost.conf
@@ -14,8 +14,8 @@ upstream backend {
 # vhosts definitions
 server {
     server_name _;
-    listen 80;
-    listen [::]:80;
+    listen 80 default_server;
+    listen [::]:80 default_server;
 
     # redirect all HTTP requests to HTTPS with a 301 Moved Permanently response.
     return 301 https://$host$request_uri;
@@ -23,8 +23,8 @@ server {
 
 server {
     server_name _;
-    listen 443 ssl http2;
-    listen [::]:443 ssl http2;
+    listen 443 ssl http2 default_server;
+    listen [::]:443 ssl http2 default_server;
 
     ## ssl
     ssl_dhparam /dhparams4096.pem;