diff --git a/scripts/upgrade b/scripts/upgrade
index ea4b614..238c2c4 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -406,7 +406,7 @@ if ! ynh_permission_exists --permission=server_api; then
                           --label="Server access for client apps." --show_tile=false --allowed=visitors \
                           --auth_header=false --protected=true
     python3 remove_sso_conf_persistent.py $domain $server_name \
-        || ynh_print_warn --message="Your file /etc/ssowat/conf.json.persistent doesn't respect the json syntax. The config file wasn't cleaned. Please clean it manually."
+        || ynh_print_warn --message="Your file /etc/ssowat/""conf.json.persistent doesn't respect the json syntax. The config file wasn't cleaned. Please clean it manually."
 else
     ynh_permission_url --permission=server_api --url=$domain/_matrix --add_url=$server_name/.well-known/matrix \
                        --auth_header=false