diff --git a/ManagedCode.Database.Cosmos/CosmosItem.cs b/ManagedCode.Database.Cosmos/CosmosItem.cs
index 700eb3d..8b8b873 100644
--- a/ManagedCode.Database.Cosmos/CosmosItem.cs
+++ b/ManagedCode.Database.Cosmos/CosmosItem.cs
@@ -11,14 +11,12 @@ public CosmosItem()
     {
         Id = $"{Guid.NewGuid():N}";
         Type = GetType().Name;
-        PartitionKey = new PartitionKey(Id);
     }
 
     public CosmosItem(string id)
     {
         Id = id;
         Type = GetType().Name;
-        PartitionKey = new PartitionKey(Id);
     }
 
     [JsonProperty("type")] public string Type { get; set; }