diff --git a/chap5_essential_language_features/essential_csharp_features/Program.cs b/chap5_essential_language_features/essential_csharp_features/Program.cs
index f9da1e5..f1126fd 100644
--- a/chap5_essential_language_features/essential_csharp_features/Program.cs
+++ b/chap5_essential_language_features/essential_csharp_features/Program.cs
@@ -10,7 +10,7 @@ namespace automatically_implemented_properties
         static void Main(string[] args)
         {
             // create and populate Shopping Cart, implementing IEnumerable<Product> interface
-            ShoppingCart products = new ShoppingCart
+            IEnumerable<Product> products = new ShoppingCart
             {
                 Products = new List<Product>
                 {