diff --git a/src/Mobile/eShopOnContainers/eShopOnContainers.Core/ViewModels/CheckoutViewModel.cs b/src/Mobile/eShopOnContainers/eShopOnContainers.Core/ViewModels/CheckoutViewModel.cs
index 4eb9010a3..1f144f654 100644
--- a/src/Mobile/eShopOnContainers/eShopOnContainers.Core/ViewModels/CheckoutViewModel.cs
+++ b/src/Mobile/eShopOnContainers/eShopOnContainers.Core/ViewModels/CheckoutViewModel.cs
@@ -22,10 +22,10 @@ namespace eShopOnContainers.Core.ViewModels
         private Order _order;
         private Address _shippingAddress;
 
-        private ISettingsService _settingsService;
-        private IBasketService _basketService;
-        private IOrderService _orderService;
-        private IUserService _userService;
+        private readonly ISettingsService _settingsService;
+        private readonly IBasketService _basketService;
+        private readonly IOrderService _orderService;
+        private readonly IUserService _userService;
 
         public CheckoutViewModel(
             ISettingsService settingsService,
@@ -212,4 +212,4 @@ namespace eShopOnContainers.Core.ViewModels
             return total;
         }
     }
-}
\ No newline at end of file
+}