diff --git a/src/Core/Components/TreeView/FluentTreeItem.razor.cs b/src/Core/Components/TreeView/FluentTreeItem.razor.cs
index 3c4007b626..6e1fedcd6a 100644
--- a/src/Core/Components/TreeView/FluentTreeItem.razor.cs
+++ b/src/Core/Components/TreeView/FluentTreeItem.razor.cs
@@ -215,6 +215,7 @@ internal static RenderFragment GetFluentTreeItem(FluentTreeView owner, ITreeView
             builder.AddAttribute(i++, "Disabled", item.Disabled);
             builder.AddAttribute(i++, "IconCollapsed", item.IconCollapsed);
             builder.AddAttribute(i++, "IconExpanded", item.IconExpanded);
+            builder.SetKey(item.Id);
 
             if (owner.ItemTemplate != null)
             {