diff --git a/Facepunch.Steamworks.Test/Client/InventoryTest.cs b/Facepunch.Steamworks.Test/Client/InventoryTest.cs
index 837b1b8..0886996 100644
--- a/Facepunch.Steamworks.Test/Client/InventoryTest.cs
+++ b/Facepunch.Steamworks.Test/Client/InventoryTest.cs
@@ -107,7 +107,7 @@ public void InventoryItemList()
                 bool CallbackCalled = false;
 
                 // OnUpdate hsould be called when we receive a list of our items
-                client.Inventory.OnUpdate = () => { CallbackCalled = true; };
+                client.Inventory.OnUpdate += () => { CallbackCalled = true; };
 
                 // tell steam to download the items
                 client.Inventory.Refresh();
diff --git a/Facepunch.Steamworks/Interfaces/Inventory.cs b/Facepunch.Steamworks/Interfaces/Inventory.cs
index d3b34e5..a6d00bf 100644
--- a/Facepunch.Steamworks/Interfaces/Inventory.cs
+++ b/Facepunch.Steamworks/Interfaces/Inventory.cs
@@ -14,7 +14,7 @@ public partial class Inventory : IDisposable
         /// Called when the local client's items are first retrieved, and when they change.
         /// Obviously not called on the server.
         /// </summary>
-        public Action OnUpdate;
+        public event Action OnUpdate;
 
         /// <summary>
         /// A list of items owned by this user. You should call Refresh() before trying to access this, 
@@ -466,6 +466,7 @@ public void UpdatePrices()
                    Definitions[i].UpdatePrice();
                }
 
+               OnUpdate?.Invoke();
            });
         }
     }
diff --git a/Facepunch.Steamworks/Utility.cs b/Facepunch.Steamworks/Utility.cs
index cdf1e8a..7ddd9b3 100644
--- a/Facepunch.Steamworks/Utility.cs
+++ b/Facepunch.Steamworks/Utility.cs
@@ -60,9 +60,14 @@ public static uint FromDateTime( DateTime dt )
 
         }
 
-        public static string FormatPrice(string currency, ulong price)
+        internal static string FormatPrice(string currency, ulong price)
         {
-            var decimaled = (price / 100.0).ToString("0.00");
+            return FormatPrice(currency, price / 100.0);
+        }
+
+        public static string FormatPrice(string currency, double price)
+        {
+            var decimaled = price.ToString("0.00");
 
             switch (currency)
             {