diff --git a/scripts/upgrade b/scripts/upgrade
index 41b1cb5..8e6e654 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -124,7 +124,7 @@ if ! ynh_permission_exists --permission sync_client; then
         --label="Sync client" --protected=true --show_tile=false\
         --additional_urls="/Microsoft-Server-ActiveSync" "/principals" "/.well-known/caldav" "/.well-known/carddav"
     python3 remove_sso_conf_persistent.py $domain \
-        || 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_update --permission="sync_client" --add='visitors' --label="Sync client" --protected=true --show_tile=false
     ynh_permission_url  --permission "sync_client" --auth_header=false\