diff --git a/scripts/upgrade b/scripts/upgrade
index 6beeaaa..2d4139e 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -215,10 +215,10 @@ 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
+    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_store_file_checksum --file="/etc/nginx/conf.d/__SERVER_NAME__.d/server_name.conf"
 
 #=================================================
 # MIGRATION 2 : MULTINSTANCE SUPPORT