diff --git a/ch04/app.py b/ch04/app.py
index fe120fd..35b4471 100644
--- a/ch04/app.py
+++ b/ch04/app.py
@@ -10,7 +10,7 @@ def get_orders_by_customer(cust_name, shipped=None, details=False):
                         dal.line_items.c.quantity,
                         dal.line_items.c.extended_cost])
         joins = joins.join(dal.line_items).join(dal.cookies)
-    cust_orders = select(columns)
+    cust_orders = select(*columns)
     cust_orders = cust_orders.select_from(joins).where(
         dal.users.c.username == cust_name)
     if shipped is not None: