diff --git a/scripts/install b/scripts/install
index 797a04a..1bfa91a 100644
--- a/scripts/install
+++ b/scripts/install
@@ -87,6 +87,7 @@ ynh_system_user_create --username=$app --home_dir=$final_path
 ynh_script_progression --message="Creating a PostgreSQL database..."
 
 db_name=$(ynh_sanitize_dbid --db_name=$app)
+db_user=$db_name
 ynh_app_setting_set --app=$app --key=db_name --value=$db_name
 ynh_psql_test_if_first_run
 ynh_psql_setup_db --db_user=$db_name --db_name=$db_name