diff --git a/src/Prism.Avalonia/Regions/ItemsControlRegionAdapter.cs b/src/Prism.Avalonia/Regions/ItemsControlRegionAdapter.cs
index 9a59b98..34c59bb 100644
--- a/src/Prism.Avalonia/Regions/ItemsControlRegionAdapter.cs
+++ b/src/Prism.Avalonia/Regions/ItemsControlRegionAdapter.cs
@@ -50,7 +50,12 @@ protected override void Adapt(IRegion region, ItemsControl regionTarget)
             }
 
             // Avalonia v11-Preview5 needs IRegion implement IList. Enforcing it to return AvaloniaList<object> fixes this.
-            regionTarget.Items = region.Views as Avalonia.Collections.AvaloniaList<object>;
+            // Avalonia v11-Preview8 ItemsControl.Items is readonly.
+            ////regionTarget.Items = region.Views as Avalonia.Collections.AvaloniaList<object>;
+            foreach (var item in region.Views as Avalonia.Collections.AvaloniaList<object>)
+            {
+                regionTarget.Items.Add(item);
+            }
         }
 
         /// <summary>