diff --git a/scripts/upgrade b/scripts/upgrade
index 16e6c2a..a7496da 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -215,10 +215,12 @@ ynh_store_file_checksum --file="/etc/matrix-$app/log.yaml"
 # Create .well-known redirection for access by federation if it doesn't exist
 if yunohost --output-as plain domain list | grep -q "^$server_name$"
 then
-    cp ../conf/server_name.conf /etc/nginx/conf.d/__SERVER_NAME__.d/server_name.conf
+    ynh_store_file_checksum --file="/etc/nginx/conf.d/__SERVER_NAME__.d/server_name.conf"
+    ynh_backup_if_checksum_is_different --file=/etc/nginx/conf.d/${server_name}.d/server_name.conf
+    cp ../conf/server_name.conf /etc/nginx/conf.d/${server_name}.d/server_name.conf
 fi
-
-ynh_store_file_checksum --file="/etc/nginx/conf.d/__SERVER_NAME__.d/server_name.conf"
+ynh_replace_string --match_string=__DOMAIN__ --replace_string=$domain --target_file="/etc/nginx/conf.d/${server_name}.d/server_name.conf"
+ynh_replace_string --match_string=__PORT__ --replace_string=$synapse_tls_port --target_file="/etc/nginx/conf.d/${server_name}.d/server_name.conf"
 
 #=================================================
 # MIGRATION 2 : MULTINSTANCE SUPPORT
@@ -285,10 +287,6 @@ then
     chmod 640 /etc/ssl/private/dh2048.pem
 fi
 
-#=================================================
-# MIGRATION 5 : CREATE A .well-known FILE
-#=================================================
-
 #=================================================
 # STANDARD UPGRADE STEPS
 #=================================================